# 4

If it's worth saying, but not worth its own post, then it goes here.

Notes for future OT posters:

2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)

3. Open Threads should start on Monday, and end on Sunday.

4. Unflag the two options "Notify me of new top level comments on this article" and "

New Comment
124 comments, sorted by Click to highlight new comments since:
Some comments are truncated due to high volume. Change truncation settings

You think like a human because you are a human. Not because this is how an intelligent being thinks.

Just a thought.

0Viliam
Generalizing-From-One-Intelligent-Species Fallacy.
0Good_Burning_Plastic
Yes, they do. That's where the extra (1 + z) factor in the definition of luminosity distance comes from.
0Thomas
I don't like this solution. There is nowhere the speed of light to be seen there. OTOH, the "curvature of space" they mention, is not very necessary in our flat space. But the Lorentz factor would be needed here. Not only for the time dilatation factor, by which the energy output is to be reduced - but also for the relativistic mass increase by the same factor. And for the length contraction as well! That's the real problem, I think.
0Good_Burning_Plastic
That's not a very useful concept, because it's nothing but the total energy measured in different units. It only has a name of its own for hysterical raisins. A much more useful concept is the invariant mass, which is the square root of the total energy squared minus the total momentum squared (in suitable units), which (as the name suggests) is the same in all frames of references; in particular, it equals the total energy in the frame of reference where the total momentum is zero. Nowadays when people say "mass" they usually mean the invariant mass, because it makes more sense to call the relativistic mass "total energy" instead.
0Good_Burning_Plastic
But it's the standard way the luminosity distance is defined. Units with c = 1 are used in the formulas. Space alone is flat (within measurement uncertainties), but space-time is curved, because space expands with time. It's not the easiest way to treat objects moving with the Hubble flow... Yes, there are two (1+z) factors, one because fewer photons are emitted per unit time because "time was slower back then" (I know, not a very clear way to put it) and one because each photon is redshifted. The luminosity distance is defined with one (1+z) factor so that when you divide by its square you get (1+z)^-2. No, because we're talking about the total luminosity of the galaxy -- if its length is contracted and its luminosity density is increased by the same factor, nothing changes. What do you mean? It's not like this is an open question in cosmology. The implications of the FLRW metric have been well known for decades.
0Thomas
Still don't like it. c = 1, but v isn't. Therefore the gamma factor is NOT a single exponential. At any moment, space has some size, a galaxy has its apparent speed, so there are mass, volume and so on, as a well defined function. Lorentz transformations of dimensions like length, clock speed and mass. I don't care if it easy or not. I just want to know how it is. A photon is usually redshifted. Some additional redshift should occur due to the mass increase, and then some additional redshift due to the increased density, which is caused by the famous length contraction. This is not true. The whole amount of emitted radiation goes down, because the escape velocity goes up. And it is more redshifted again. I am not sure, how well known or not well known they are. Or for how long known. I just ask a question. Do we see any relativistic effects on (far) away galaxies. If we do, fine. If we do not, also fine.
0Good_Burning_Plastic
Yes. Thanks. Fixed.
0simon
It's all baked into z. z is defined based on frequency change but the frequency change must also be the amount it appears to be slowed down, since e.g. you could measure the number of peaks in a light wave coming from a galaxy as a measure of time. For the benefit of others: in making this post Thomas is I expect motivated by my responses to his post here: https://protokol2020.wordpress.com/2013/09/06/embarrassing-images/#comments In an edit to my last comment, Thomas wrote: In reply about the blue shift galaxies: they will indeed appear to be sped up from our perspective. Something moving toward us is slowed down in our reference frame by time dilation, but also appears sped up because light takes less and less time to get here. As with redshift, both of these effects are baked into z, so the final (apparent) speedup is what you get from z.
0Thomas
Yes. You were my inspiration for this problem. How exactly is everything baked into z? The mass is increased and volume is decreased by factor gamma. So the density is increased by gamma squared. Do we really see that?
0simon
You can use a light wave as a clock. The ratio of frequency that the light wave is emitted at to the frequency we perceive is 1+z. Thus, the ratio of the time we observe a galaxy for to the amount of time that elapsed in the galaxy's proper time is also 1+z. For non-relativistic motion, the speed is approximately proportional to the redshift, but as speeds get higher, that breaks down. Apparent slowdown in terms of v will involve a Lorentz factor, but in terms of z it will not, because of the definition of z being in terms of apparent slowdown (of light).
0Thomas
Not directly. You have to square the velocity of a galaxy, then you must divide it by c (light speed). Then you must divide it by c once again. Then you have to subtract 1, change the sign, compute the square root. Regardless of the direction of the galaxy in question. You are very wrong here, I am sorry. But that's beside the point. We want the right solution and that solution should be in a good agreement with all those Hubble pictures.
2simon
Let me try to explain more clearly. Imagine there are aliens in the high-z galaxy. They produce a laser beam with a particular frequency, pointed at us. There are also other events occurring in their galaxy, for simplicity at the beam source. The aliens measure the time between two events as a particular number of cycles of the laser light. Now when we observe the laser light and the events, we must also measure the time between the events as the same number of cycles of the laser light apart. But, we see the cycles at a lower frequency by a factor of 1+z, so we also see the two events an increased time apart by a factor of 1+z. Now, it seems to me that maybe the issue is disagreement on what exactly we are measuring. What I am talking about is what we see when we look through a telescope. But it seems to me that maybe what you are talking about is what is "really" there in "our" reference frame. Unfortunately that latter thing is ambiguous since you can extend our reference frame to the other galaxy in different ways. It's true that you can view far away galaxies as actually moving away from us rather than stationary in an expanding universe - both are valid ways of looking at reality in general relativity. But, there's a reason most astronomers use metrics in which galaxies are (almost) stationary: it's much simpler and less confusing.
0Thomas
Do you think, the Lorentz factor id somehow present in z, or not?
0simon
z represents frequency differences which is the same as apparent slowdown (or speedup for blueshift). Note, this is apparent slowdown in the sense of what we see through a telescope, not how much it is "really" slowed down in "our" reference frame. Now, when we imagine an extending our reference frame to that other galaxy in a particular way such that in that particular extension of our reference frame the slowdown is caused by motion rather than by universe expansion, then we use the relativistic doppler shift formula to get a speed. That formula involves a Lorentz factor (or rather a sqrt ((1+v/c)/(1-v/c)) factor). Edit: for clarity, the relativistic doppler formula I think should be better represented as (1+v/c)/sqrt(1-(v/c)^2). This makes it more clear that it's a Lorentz factor (the denominator) representing the relativistic time dilation in combination with the numerator which represents the non-relativistic doppler effect (due to the time it takes light to get here increasing as the thing moves farther away). Another later edit: We actually don't want to just use a doppler formula, at least if in the standard picture the expansion rate of the universe is changing. That's because the expansion rate changes via a gravitational effect that would also be expected to have a gravitational doppler effect. So in a no-expansion picture we want a combination of doppler effect and gravitational redshift (at least for a changing expansion rate), just nothing from stretching of space.
0Thomas
Good. So we see a galaxy going away with the 99% c - 7 times dimmer plus Doppler red shift? 49 times denser as well? Some neutron stars are apparent black holes?
2simon
Because of relativistic invariance (or Lorentz covariance or whatever the official term is), the dynamics will not change if we calculate something in a reference frame in which an object is moving, as compared to if we calculate something in the reference frame in which it is stationary, then translate to that reference frame in which it is moving. In particular neutron stars will not change to black holes, we will see things moving around in the same way despite the differences in density between the reference frames, etc.
0Thomas
Splendid. So a fast receding neutron star is "invariant" to the relativistic mass increase. Good to know. A neutron is sensitive to it, a neutron star isn't.
2simon
Something moving in our reference frame has a mass increase from the kinetic energy it has in our reference frame. It just doesn't turn into a black hole. I don't yet intuitively understand why (without doing the work of calculating it which might be a lot of work), but: Lorentz covariance is a property of our current theories of physics, so a calculation according to our current theories must return that result (that whether an object is a black hole or not is independent of speed). So, it does no good to sarcastically say that that our current theories must return some other result, and then try to use that claim of what you think the calculation would return as evidence against current theories.
0Thomas
I don't understand you. Are those galaxies relativistically "deformed" or not?
2simon
This question can be potentially be interpreted in two ways: 1) "are" the galaxies "really" deformed due to relativistic effects? 2) do the galaxies appear deformed when viewed in a telescope? The answer to the first question depends on how you extend our reference frame out to them. If you do it in the standard way then they aren't "really" length contracted (or actually in a sense they're expanded, since in the past the same size of galaxy would occupy a larger portion of the universe). If you do it in a way that views the redshift as due to motion (e.g. you go back in time along the light beam reaching us from the galaxy, at each point laying down a space and time coordinate system such that a "stationary" observer according to that coordinate system sees the light beam as having the same redshift that we see) then it is "really" length contracted. (Edit: as good burning plastic pointed out in a response below, it's better not to think of it as a real effect. Rather I think it's better to regard this as definitional - is the galaxy deformed according to the coordinate system we are using.) The answer to the second question is readily observable. So we should calculate the same answer no matter how you extend the reference frame to the other galaxy, if it's correct that they are both valid pictures. Now, since our telescopes see a 2-d picture, the easy answer, that I gave in response to the post on your blog, is that since the motion is almost directly away from us any distortion is along our line of sight and thus is not visible as a deformation in the telescope. Now I also wanted to do a calculation for 3d telescopes, but I found it difficult to do the calculation for the motion-only-no-expansion picture so am dropping that part of this comment. For a brightness-based distance measure, I think it's actually an increase, not contraction, of apparent size of a galaxy in the depth direction that you get (as calculated in the standard picture at least). (edi
0Good_Burning_Plastic
Even in flat Minkowski space-time and even with stereo vision, no they wouldn't, because the fact that the light from the far side of an object left it earlier than the light from the near side compensates the length "contraction". If anything, if the object is moving perpendicularly to the line of sight you would see it rotated. (And I find "length contraction" a pretty misleading name. It's a purely kinematic effect due to the geometry of spacetime, and no more of a "contraction" than the fact that the height of a pencil is less if it's askew than if it's upright.)
0simon
No, if an object is moving away from you in Minkowski space time, the time difference of light coming from the far side and from the near side doesn't compensate the "contraction" - it actually increases the apparent contraction (assuming 3-d perception). For an object moving toward you, it counteracts as you say (and in fact makes the object appear (with our 3-d, but still light-based, camera) longer, just as it also appears to be sped up). Also what you see when observing a perpendicular motion isn't actually a rotation. Imagine a cube with opaque edges but otherwise transparent, running at high speed along tracks that are touching and aligned with the edges. The edges must remain touching and aligned with the tracks from any observer's point of view. So it's not a rotation but some kind of skew. A sphere will still look circular from a moving observer's point of view though. Agreed. I would in fact go further, in that it's not so much the effect of the geometry of spacetime, as an effect of how we choose to define a coordinate system on that geometry.
0Thomas
Can you just answer either: A - Yes, they are deformed and this is visible on our pictures. B - No, there is no deformation to be seen on our pictures.
0simon
B - No deformation to be seen in our pictures.
0Thomas
Okay. Thank you for this straight answer. No deformations. No relativistic mass increase. Which should also be visible via orbital velocities inside those galaxies. But that wouldn't be a problem at all, we have the dark matter for such cases. Even here at home. In any case, some galaxies are superluminal, what's the use of relativistic effects for them? No use.
0simon
No, there is a relativistic mass increase in the galaxies-moving-away picture, and I expect deformation along our line of sight (so not visible in our photographs). No superluminal galaxies. In the galaxies-moving-away picture, you get the speed by applying the relativistic redshift formula to get the speed from the redshift, which will always come out less than the speed of light while they're still visible to us. In the conventional picture the galaxies are almost stationary wrt the coordinate system used; you can come up with a superluminal speed by asking "how quickly is the distance between us and that galaxy increasing" where distance is referring to the distance the standard picture would say they are apart from us currently. But that isn't motion but a change of a distance due to expansion of the universe.
0Thomas
You are mistaken. https://arxiv.org/abs/astro-ph/0011070 There are superluminal galaxies. Quote:
0simon
They are defining distance based on the conventional picture, then asking how fast it is increasing with time, as I mentioned in my above comment.
0Thomas
They are "defining " in a way, that no galaxy is bound to any visible relativistic effect. Everybody does that, albeit on at least two different ways. How convenient! We have superluminal galaxies, not bound to relativity. We have nearly light speed galaxies, free of any observable relativistic effect. Our hypothetical ancient space ship sent there (to a nearly light speed away moving galaxy), would slow down all its clocks, the surrounding galaxy wouldn't. Funny.
2simon
Unimportant answer: No, it will appear to have slowed down clocks (as was explained to you at the beginning of this thread) and the ancient ship, if it is now at the same distance and stationary with respect to that galaxy, will appear to have the same slowdown. The more important answer: at this point, this discussion as it is going now is looking pointless. You have intuitions, backed up by some argumentation, but without a complete mathematical picture, that general relativity produces predictions that don't match observations. I have intuitions, backed up by other argumentation, also without a complete mathematical picture, that general relativity produces predictions compatible with observations. I think my intuitions are better supported, but that's not what it important. What is important: general relativity is a physical theory, published long ago and available to anyone, such that this argument can be resolved once and for all by actually doing the math. I am too lazy to do it for the purposes of a comment debate (I might possibly do a blog post though, if it turns out not to be too much work). You come across as probably smart enough to learn how to do the math, so get a general relativity textbook and work it out. You should subjectively estimate a much bigger gain than I do from doing the math, given your subjective assessment that GR gives false predictions and my subjective assessment that it gives true predictions: whoever disproves general relativity will probably get a Nobel prize.
0Thomas
I don't think, that my intuition should be backed by, or crushed by (doesn't matter which, really) - more mathematics. I think my intuition should be backed or crushed by some experimental evidence. Which we probably have. It seems to me, that no relativistic time slowdown is observed in distant galaxies. What are implications for the GR I really don't care very much. Theories in Physics are downstream of how the reality is.
2gjm
If you are correct then cosmologists either (1) are very stupid or (2) are knowingly in possession of strong evidence against a pretty much universally accepted, and central, part of physics but haven't said anything about it. I am extremely confident that #1 and #2 are both false. Of course this isn't scientific evidence that you're wrong, and if for some reason anything of substance hung on this then it would be appropriate to look more carefully at the evidence and the theory and the mathematics and see what's going on. And if you really think you've got good evidence that relativity is wrong then you should do the work and collect your Nobel prize. For my part, simply on the basis of #1 and #2 (plus the absence of any reason to think you're so astoundingly smart that it would be unsurprising for all the world's cosmologists to have simply missed something that you see intuitively) I am confident enough that you're wrong that I feel no inclination to go to that effort to confirm that the received wisdom hasn't just yet been overthrown.
0Thomas
I am not very eager to fight against, or for the GR. I don't care that much about this. It's a low priority suitable maybe for my occasional blog post and a crosslink to here, where debates are quite long. Still, no apparent time slowdown in those fast moving galaxies, or some apparent time slowdown -- is a bit interesting topic. Isn't it?
0simon
As I mentioned earlier, you could count the number of cycles of a laser light beam between two events. For this reason, the apparent slowdown has to be proportional to the redshift. This is a fairly general argument that should work for more theories than just general relativity. In order for there not to be an apparent slowdown, something really wierd would have to be going on.
1Thomas
We have seen weirder things going on. A superluminal galaxy is quite weird, isn't it? At one moment, nothing can be faster than light, the next moment there is a billion of faster than light galaxies. The next moment, it's okay, they are not faster than light, only the space is replicating itself between us an them. The next moment the space is growing exponentially. What is not that weird, we are accustomed to exponentials when replicating is involved. Nothing is really weird, except the logic must not be violated. Everything else can be weird as it wants to.
0Good_Burning_Plastic
Exactly. If you have two ants on a rubber band and you stretch the rubber band, the time derivative of the distance between the ants may be larger than twice the maximum speed at which an ant can walk, but that's not due to the ants walking so there's no paradox.
0Thomas
I am not that sure, that there is no paradox. As I see, it can easily be. There is a smaller chance that there isn't any paradox, after all. Still possible. I wish, I could find an internet site, which would address those problems. I can't. Can you?

Sometimes we talk about unnecessarily complex potential karma/upvote systems, so I thought I would throw out an idea along those lines:

Every time you post, you're prompted to predict the upvote/downvote ratio of your post.

Instead of being scored on raw upvotes, you're scored on something more like how accurately you predicted the future upvote/downvote ratio.

So if you write a good post that you expect to be upvoted, then you predict a high upvote/downvote ratio, and if you're well calibrated to your audience, then you actually achieve the ratio you predict...

5entirelyuseless
Knowing that your post will get a low score is not equivalent to knowing that it is bad.
0moridinamael
That's true. But there are few circumstances that would warrant posting a comment that you know most people in your community will think is bad. If you want to say something you expect to be unpopular, you can almost always phrase it in away that contextualizes why you are saying it, and urges people to consider the extenuating context before downvoting. If you don't do this, then you're just doing exactly what you shouldn't be doing, if your goal was to make some kind of change. edit: Another possibility would be this: instead of suppressing posts that you have predicted to be poorly received, the system simply forces you to sit on them for an hour or so before posting. This should reduce the odds that you are writing something in the heat of the moment and increase the relative odds that your probably-controversial post is actually valuable.
3gilch
I get the feeling that LW has a lot of lurkers with interesting things to say, but who are too afraid to say them. They may eventually build up the courage they need to contribute to the community, but this system would scare them off. They don't yet have enough data to predict how well their posts would be received. We need to be doing the opposite and remove some of the barriers to joining in. On the other hand, trolls don't care that much about karma. They'll just exploit sock puppets.
3moridinamael
Yeah, LW would probably not be the place to try this. I would guess that most potential karma systems only truly function correctly with a sufficient population of users, a sufficient number of people reading each post. LW has atrophied too much for this.
0ProofOfLogic
I really like the idea, but agree that it is sadly not the right thing here. It would be a fun addition to an Arbital-like site.
1tristanm
The thing is that without downvotes, there aren't actually that many barriers to joining in. If someone has a problem with something you say, they have to actually say so, instead of just downvoting, which is what often happens on Reddit. And I think this is better because it forces negative reward to be associated with feedback, so that people who either have misunderstandings or are poor articulators of their views can get better over time. The worst thing is getting downvoted without knowing why. I don't know if this has been tried anywhere, but maybe a system where every vote would necessitate a comment would work better, so that why a remark was received a particular way by the community would be well understood.

This is a response to this comment.

Can you clarify what you mean by phenomenological and existentialist stances, and what you mean by saying that there is no true ontology? I agree that we could use somewhat different models of the world. For example, we don't have to divide between dogs and wolves, but could just call them one common name. I don't see what difference this makes. Dogs and wolves still exist in the world and would be potentially distinguishable in the way that we do, even if we did not distinguish them, and likewise the common thing would s...

0Gordon Seidoh Worley
By the phenomenological stance I mean that I believe the world is only known through experience. This reduces down in terms of physics to something like "all information is generated by observation" where "observation" is the technical term used to mean the sort of physical measurement we encounter in quantum physics where entropy is generated. If there is anything more going on that's fine, but we still won't know about it except through the standard process by which classical information is generated. By the existential stance I mean simply that I believe the world exists first. This seems sort of obvious, but the alternative is essentialism, which assumes there is some structure to the world that determines its existence. The question is which comes first, ontology or metaphysics. Existentialism says ontology comes first, and through ontology we can discover metaphysics. Essentialism says the opposite, that metaphysics reveals ontology (naturally for this reason metaphysics and ontology are often not clearly distinct in essentialist perspectives). I think it's worth noting that both these perspectives are often only nominally or shallowly respected. I think a lot of this is because the phenomenological stance implies that we only have an inside view, and any "outside" view of the world we obtain is necessarily an inference from our inside view of the world. But it's quite easy to accidentally conclude the outside view we've inferred is timeless (this is, after all, seen by many as the entire point of philosophy: to discover timeless truths), so there is a risk of short circuiting both phenomenology and existentialism to produce ontological realism and essentialism, respectively. I believe the combination of these two is necessary. Accepting the phenomenological stance we are forced either into Husserl's idealism and transcendental phenomenology or realism. Since idealism makes untestable claims, even if it is true I can't really say much about it, so I must ta
0entirelyuseless
0Gordon Seidoh Worley
Hmm, so some of this sounds like I may misunderstand the terminology of academic philosophy. I'm trying to learn it, but I generally lack a lot of context for how the terminology is used so I largely have to go with what I find to be the definitions suggested by summary articles as I find I want to talk about some subject. In many cases I feel like the terminology is accidentally ignoring parts of theory space I'd like to point to, though I'm not sure if that's because I'm confused or academic philosophy is confused. Yet it seems to be the primary shared language I have available for talking about these subjects other than going "full-Heidegger" and being deliberately subtle to hide my meaning from all who would not bother to do the work to think my thoughts. On some particular points: Sure, I only included the physical explanation because I wanted to be clear that I'm talking about a fundamental kind of thing here by "experience" and not, say, the common use of the word "experience". Unfortunately existing phenomenology lacks, from what I can tell, a rigorous way of talking about experience as generic information transfer. This is one such case where maybe the terminology fails me. Perhaps the existentialist/essentialist divide is not the one I mean. I want to separate those theories that conflate ontology, especially teleological aspects of ontology, with metaphysics from those that view them as separate. Once we have them separate, then we seem to be able to talk about idealism and realism from a perspective of structure creates reality or reality creates structure (i.e. ontology determines metaphysics or metaphysics determines ontology). It is this latter latter case I mean to be in: ontology, which is necessarily discovered only through experience) is the lens through which we can try to discover metaphysics, but metaphysics is ultimately about the stuff that exists prior to the understanding of its structure, and that there is literally nothing you can say
1entirelyuseless
I think I understand your position a little better now. I still think it is at least expressed in a way which is more skeptical than necessary. In my theory, the teleological aspects of things are pretty directly derived from metaphysics. Galileo somewhere says that inertia is the "laziness" of a body, or in other words the answer to "Why does this continue to move?" is "Because it continues to remain what it is." Once you have this sort of thing, it is easy enough to see why you get the origin of life, which seems to have purpose, and then the evolution of complex life, which seems to have complex purposes. In this way, ultimately all questions of final cause, "for what purpose," reduce to this answer: because things tend to remain what they are. Now maybe we can't explain the metaphysics behind things remaining what they are, but it is surely something metaphysical. I think I mostly agree with that, actually, but I don't think we should conclude that there aren't true statements. I'll say more about this in the context of money vs ethics below. Dan Dennett is always arguing against "essentialism," and I find myself agreeing mostly with his arguments while disagreeing with the anti-essentialist conclusion. Basically his main point, in almost every case, is that things have vague boundaries, not permanent white and black once and for all boundaries. He takes this as an argument against essentialism because he takes essentialism to mean a description of the world where you reduce everything to a complex of "A, B, C, etc." and A is there or not, B is there or not, C is there or not. Everything is black or white. I agree that the world is not like that, but I disagree with his conclusion about how it is, or rather it seems that he has no alternative -- "the world is not like that," but he cannot say in any sense how it is instead. I agree that boundaries are vague; in fact, I would assert that all verbal boundaries are vague, including the boundaries of words that
0Gordon Seidoh Worley
This, I think, gets at why I don't want to acknowledge "true" and "false", because it seems to me the only way to salvage those terms is to make them teleological to the purpose of likelihood of matching experiences of reality. I guess this is fine but it's not really what most people mean when they say "true" and "false" as far as I can tell, so it seems better to reject the notions of "true" and "false" to avoid confusion about what we're discussing.
0entirelyuseless
This is at least very close to what I meant. Consider this situation: you are walking along, and you see a man in the distance. "That looks like a pretty tall fellow," you say. When he approaches you, you can see how tall he is. Was your statement true or false? It is obvious that "pretty tall fellow" does not name a specific height or even give a minimum. So what determines whether your statement was true or not? You will almost certainly say that you were right if you do not find yourself surprised by his height compared to what you expected, or if you find him surprisingly tall, and similarly you will say that you were wrong if you find him surprisingly short compared to what you expected. But what do you think people really mean instead? I think pretty much everyone would agree with the above example: you are mistaken if you are surprised in the wrong direction, and you are right if you are not surprised, or if you are surprised in the right direction. I suppose theoretically someone could say that truth and falsity mean that there is a bit somewhere in his metaphysical structure which has the value of 0 or 1, in such a way that "he is tall" is true if the bit is set to 1, and false if the bit is set to 0. But it seems obvious that this is not what people would normally mean at least when talking about this situation, even if they might sometimes say abstract things that sound sort of like this. And people will sometimes explicitly assert that there is something like such a bit in a particular case, e.g. whether or not something is human. This assertion is almost certainly false, but it is not some special kind of falsity about the existence of truth and falsity; they are simply mistakenly asserting the existence of such a bit in roughly the same way someone is mistaken if the person called tall turns out to be 4'11'. So I don't see how people mean something different from this by truth and falsity, or at least significantly different. I think that doxastic
0Gordon Seidoh Worley
Right, I don't expect my position to make much of a difference to most people most of the time. Perhaps this is a matter of how I perceive the context of my readers, but I generally expect them to be more likely to make the mistake of even accidentally thinking of what I might call "true" and "false" for what we might call the "hard essentialist" version of truth (there are truth bits in the universe) when discussing topics that are sufficiently abstract. It seems mostly to matter when I want to give a precise accounting of my thoughts (or more precisely my experience of my thoughts). This gets at why I feel "in-between" in many ways: rejecting truth the way nihilists and solipsists do is not where I mean to end up, but not rejecting truth in at least some form seems to me to deny the skepticism I think we must take given the intentional appearance of experience. Building from "no truth" to "some kind of truth" seems a better approach to me than backing down from "yes truth". This may be because I find myself in a society where idealism and dualism are common and rationalists and other folks who favor realism often express it in terms of strict materialism that often denies phenomenological intentionality (even if unintentionally). Maybe I am too far removed from general society these days, but I feel it more important to accentuate intentionality over the strict materialism I perceive my target readers are likely to hold if they don't already get what I'm pointing at. You seem to be evidence, though, that this is misunderstanding, although I suspect you are an outlier given how much we agree. Agreed. I expect us all to remain confused in a technical sense of having beliefs that do not fully predict reality. But I also believe it virtuous to minimize that confusion where possible and practical.

Sorry for the delay in the creation of this open thread. Yesterday I didn't even check, usually someone steps up to the task. Anyway, it's here.

So...

Google News, US edition, front page, science section:

Russia's Fedor robot has learned to shoot guns with impressive precision. How do companies like Google, groups and individuals try to stop killer robots from taking over the world?

...are you happy now?

kickstarting as a funding method of scientific research.

" In Bollen’s system, scientists no longer have to apply; instead, they all receive an equal share of the funding budget annually—some €30,000 in the Netherlands, and \$100,000 in the United States—but they have to donate a fixed percentage to other scientists whose work they respect and find important. “Our system is not based on committees’ judgments, but on the wisdom of the crowd,”

``Bollen and his colleagues have tested their idea in computer simulations. If scientists allocated 50% of thei``
...
3Viliam
Let's make predictions about what kind of bad incentives will this create. ;) My guess: If scientics can choose who receives what fraction, they will donate 99% to their friends (who in return will donate 99% to them). If instead it depends on the number of cited works, or something like that, scientists will try to publish research in as many small articles as possible, hoping that multiple articles will be cited instead of one. (But they already do this, don't they?) If multiple articles from the same author count as one, scientists will trade parts of their research with other scientists, like: "I will let you publish the second half of my article, if you let me publish the second half of your article" (hoping that both parts get cited).

I have said before that I think consciousness research is not getting enough attention in EA, and I want to add another argument for this claim:

Suppose we find compelling evidence that consciousness is merely "how information feels from the inside when it is being processed in certain complex ways", as Max Tegmark claims (and Dan Dennett and others agree). Then, I argue, we should be compelled from a utilitarian perspective to create a superintelligent AI that is provably conscious, regardless of whether it is safe, and regardless whether it kill...

7simon
I would consider the option of creating a utility monster to be a reductio ad absurdum of utlitarianism.
Why?
3simon
Because it doesn't seem right to me to create something that will kill off all of humanity even if it would have higher utility. There are (I feel confident enough to say) 7 billion plus of us actually existing people who are NOT OK with you building something to exterminate us, no matter how good it would feel about doing it. So, you claim you want to maximize utility, even if that means building something that will kill us all. I doubt that's really what you'd want if you thought it through. Most of the rest of us don't want that. But let's imagine you really do want that. Now let's imagine you try to go ahead anyway. Then some peasants show up at your Mad Science Laboratory with torches and pitchforks demanding you stop. What are you going to say to them?
2entirelyuseless
This isn't really about utility monsters. The same argument will apply, equally well or equally badly, to any situation where we ask, "What do you think about replacing humanity with something better?" Probably dinosaurs would have objected, if they could, to being replaced by humans which are presumably better than them, but it does not change the fact that the resulting situation is better. And likewise, whether or not humans object to being replaced by something better, it would still be better if it happens.
5simon
"Better" from whose perspective? If it's "This thing is so great that even all of us humans agree that it killing us off is a good thing" then fine. But if it's "Better according to an abstract concept (utility maximization) that only a minority of humans agree with, but fuck the rest of humanity, we know what's better" then that's not so good. Sure, we're happy that the dinosaurs were killed off given that is allows us to replace them. That doesn't mean the dinosaurs should have welcomed that.
0entirelyuseless
I meant better from the point of view of objective truth, but if you disagree that better in that way is meaningful, we can change it to this: Something, let's call it X, comes into existence and replaces humanity. It is better for X to be X, than for humans to be humans. That is a meaningful comparison in exactly the same way that it is meaningful to say that being a human being is better (for human beings of course) than being a dinosaur is (for dinosaurs of course.) That does not mean that humans would want X to come into existence, just as dinosaurs might not have wanted to be wiped out. But from a pretty neutral point of view (if we assume being human is better for humans than being a dinosaur is for dinosaurs), there has been improvement since the dinosaurs, and there would be more if X came into existence. Also, there's another issue. You seem to be assuming that humans have the possibility of not being replaced. That is not a real possibility. Believing that the human race is permanent is exactly the same kind of wishful thinking as believing that you have an immortal soul. You are going to die, and no part of you will outlive that; and likewise the human race will end, and will not outlive that. So the question is not whether humanity is going to be replaced. It is just whether it will be replaced by something better, or something inferior. I would rather be replaced by something better.
1Lumifer
Better or inferior from which point of view?
0entirelyuseless
Since I said I would rather be replaced by something better, I meant from my point of view. But one or way another, since we will be replaced by something different, it will be better or worse from pretty much any point of view, except the "nothing matters" point of view.
0simon
Regarding your first 4 paragraphs: as it happens, I am human. Regarding your last paragraph: yes most likely, but we can assess our options from our own point of view. Most likely our own point of view will include, as one part of what we consider, the point of view of what we are choosing to replace us. But it won't likely be the only consideration.
0entirelyuseless
Sure. I don't disagree with that.
Haha, yea I agree there are some practical problems. I just think in the abstract ad absurdum arguments are a logical fallacy. And of course most people on Earth (including myself) are intuitively appalled by the idea, but we really shouldn't be trusting our intuitions on something like this.
1simon
If 100% of humanity are intuitively appalled with an idea, but some of them go ahead and do it anyway, that's just insanity. If the people going ahead with it think that they need to do it because that's the morally obligatory thing to do, then they're fanatic adherents of an insane moral system. It seems to me that you think that utilitarianism is just abstractly The Right Thing to Do, independently of practical problems, any intuitions to the contrary including your own, and all that. So, why do you think that?
0Dagon
Really? I think almost everyone has things that are intuitively appalling, but they do anyway. Walking by a scruffy, hungry-looking beggar? Drinking alcohol? there's something that your intuition and your actions disagree on. Personally, I'm not a utilitarian because I don't think ANYTHING is the Right Thing to Do - it's all preferences and private esthetics. But really, if you are a moral realist, you shouldn't claim that other human's moral intuitions are binding, you should Do The Right Thing regardless of any disagreement or reprisals. (note: you're still allowed to not know the Right Thing, but even then you should have some justification other than "feels icky" for whatever you do choose to do).
1g_pepper
But, even a moral realist should not have 100% confidence that he/she is correct with respect to what is objectively right to do. The fact that 100% of humanity is morally appalled with an action should at a minimum raise a red flag that the action may not be morally correct. Similarly, "feeling icky" about something can be a moral intuition that is in disagreement with the course of action dictated by one's reasoned moral position. it seems to me that "feeling icky" about something is a good reason for a moral realist to reexamine the line of reasoning that led him/her to believe that course of action was morally correct in the first place. It seems to me that it is folly for a moral realist to ignore his/her own moral intuitions or the moral intuitions of others. Moral realism is about believing that there are objective moral truths. But a person with 100% confidence that he/she knows what those truths are and is unwilling to reconsider them is not just a moral realist, he/she is also a fanatic.
0simon
OK, I guess I was equivocating on intuition. But on your second paragraph: I don't think I actually disagree with you about what actually exists. Here are some things that I'm sure you'll agree exist (or at least can exist): * preferences and esthetics (as you mentioned) * tacitly agreed on patterns of behaviour, or overt codes, that reduce conflict * game theoretic strategies that encourage others to cooperate, and commitment to them either innately or by choice Now, the term "morality", and related terms like "right" or "wrong", could be used to refer to things that don't exist, or they could be used to refer to things that do exist, like maybe some or all of the the things in that list or other things that are like them and also exist. Now, let's consider someone who thinks, "I'm intuitively appalled by this idea, as is everyone else, but I'm going to do it anyway, because that's the morally obligatory thing to do even though most people don't think so" and analyze that in terms of things that actually exist. Some things that actually exist that would be in favour of this point of view are: * an aesthetic preference for a conceptually simple system combined with a willingness to bite really large bullets * a willingness to sacrifice oneself for the greater good * a willingness to sacrifice others for the greater good * a perhaps unconscious tendency to show loyalty for one's tribe (EA) by sticking to tribal beliefs (Utilitarianism) in the face of reasons to the contrary Perhaps you could construct a case for that position out of these or other reasons in a way that does not add up to "fanatic adherent of insane moral system" but that's what it's looking like to me.
0g_pepper
I don't see why not; after all, a person relies on his/her ethical intuitions when selecting a metaethical system like utilitarianism in the first place. Surely someone's ethical intuition regarding an idea like the one that you propose is at least as relevant as the ethical intuition that would lead a person to choose utilitarianism. I don't see why. It appears that you and simon agree that utilitarianism leads to the idea that creating utility monsters is a good idea. But whereas you conclude from your intuition that utilitarianism is correct that we should create utility monsters, simon argues from his intuition that creating a utility monster as you describe is a bad idea to the conclusion that utilitarianism is not a good metaethical system. It would appear that simon's reasoning mirrors your own. Like the saying goes - one persons's modus ponens in another person's modus tollens.
0Viliam
Are we actually optimizing for "subjective happiness"? That's the wireheading scenario. I would say that wireheading humans seems better than killing humans and creating a wireheaded machine, but... both scenarios seem suboptimal. And if you instead want to make a machine that is much better at "human values" (not just "subjective happiness") than humans... I guess the tricky part is making the machine that is good at human values.

Maybe this has been discussed ad absurdum, but what do people generally think about Facebook being an arbiter of truth?

Right now, Facebook does very little to identify content, only provide it. They faced criticism for allowing fake news to spread on the site, they don't push articles that have retractions, and they just now have added a "contested" flag that's less informative than Wikipedia's.

So the questions are: does Facebook have any responsibility to label/monitor content given that it can provide so much? If so, how? If not, why doesn't t...

9Lumifer
It's a horrible idea. No. You're confusing FB and Google (and a library, etc.) I wouldn't. I recommend acquiring some familiarity with the concept of the freedom of speech.
5denimalpaca
8Lumifer
You seem to be mistaken about your familiarity with the freedom of speech. In particular, you're confusing it with the 1st Amendment to the US Constitution. That's a category error. LOL. Would you assert that you represent the masses? A stunning example of narcissism :-P Hint: it's not all about you and your lack of insight.
2Osho
So are you going to actually explain why "freedom of speech" (not a negative right, but platform owners allowing users to post whatever they want) is a good thing?
0Lumifer
Sniff... sniff... smells like a bad-faith question. You don't imagine you're setting a trap for me or anything like that?
1tristanm
Can you at least try to articulate why you believe this? When you make a statement like this with very few arguments, in response to a genuine question, it doesn't matter if you feel the post you're responding to is incredibly misguided or based on poor understanding. It's simply condescending to respond this way. Now, as of my writing this comment, your response has 6 upvotes. For a forum with a lot of posts with zero votes, it's pretty rare to have posts with this many upvotes, unless a lot of community members feel your response added a lot of light to the conversation. So if anyone is reading this who upvoted Lumifer's post, can you explain why you felt it was worthy? This a pretty deep mystery for me on a forum where people who argued things in such depth, like Eliezer or Yvain, are usually held as people we should try to emulate.
2Lumifer
No, I don't think so. A short answer does not implicitly accuse the question of being stupid or misguided. It was a simple direct question. I have a simple direct answer to it without much in the way of hedging or iterating through hands or anything like that. If someone asks you "vanilla or chocolate?" and you're a chocoholic, you answer with one word and not with a three-page essay on how and why your love for chocolate arose and developed. Now your question of "why?" could easily lead to multiple pages but tl;dr would be that I like freedom, I don't like the Ministry of Truth, and I think that power corrupts. I would offer a guess that the upvotes say "I agree" and not "this was the most insightful thing evah!" :-)
1MrMind
I don't think that freedom of speech is enforceable inside a private-owned network.
5Lumifer
We're talking about "should", the normative approach. A private entity can do a lot of things -- it doesn't mean that it should do these things. Freedom of speech is not just a legal term, it's also a very important component of a civil society.
2MrMind
Still: should Lesswrong allow the discussion of any off-topic subject just because "free speech"?
2Lumifer
...did anyone claim anything like that?
0MrMind
You did, implicitly.
0Lumifer
I did not. You read me wrong.
Lumifer didn't say anything about enforceability. E.g. the boy scouts have the right (as a private group, if you accept that a group with the U.S. president as their figurehead is in fact private) to disallow membership based on gender, sexual orientation, or religion. That doesn't mean it is right for them to do so. One should expect that in a civilized society groups like the boy scouts shouldn't discriminate based on things like sexual orientation. But that doesn't necessarily imply that there should be regulatory action to enforce that. Likewise, Facebook should be a public commons where freedom of speech is respected. But that doesn't mean I'd call for regulatory enforcement of that.
0MrMind
Agreed in principle, but there are certain situations where the boundaries are much less clear. Should I in a gentleman's club allow women? Obviously not, and it's not even discrimination. Should I in Lesswrong allow the discussion of theology? Obviously not, and someone shouldn't, in the normative sense, invoke freedom of speech to allow trolling. At the same time, I can create a social network which is devoted to the dissemination of only carefully verified news, and no one should be able to invoke freedom of speech to hijack this mission.
3Lumifer
LW discusses theology all the time, it just uses weird terminology and likes to reinvent the wheel a lot. The whole FAI problem is better phrased as "We will create God, how do we make sure He likes us?". The Simulation Hypothesis is straight-up creationism: we were created by some, presumably higher, beings for their purposes. Etc.
0MrMind
You are strawmanning both positions a lot...
4Lumifer
No, I'm being quite literal here. I see no meaningful difference between a god and a fully-realized (in the EY sense) AI. And the Simulation Hypothesis is literally creationism. Not necessarily Christian creationism (or any particular historic one), but creationism nonetheless.
0tukabel
Hell yeah, bro. Sufficiently advanced Superintelligence is indistinguishable from God.
1ChristianKl
I don't think we have any ban on discussion on theology or that it was mentioned in any discussion we had about what might be valid reasons to ban a post.
0MrMind
Theology was just an example, but a relevant one: in a forum devoted to the improvement of rationality, discussing about some flavor of thoughts that have by long being proved irrational should amount to trolling. I'm not talking trying to justify rationally theism, that had and might still have a place here, but discussing theology as if theism was true shouldn't be allowed. On the other hand, you cannot explicitly ban everything that is off-topic, so that isn't written anywhere shouldn't be a proof against.
0ChristianKl
LW never used to have an explicit or implicit ban against being off-topic. Off-topic posts used to get downvoted and not banned. We delete spam, we delete advocacy of illegal violence and the Basilisk got deleted under the idea that it's a harmful idea. An off-topic post about theism would be noise and not harmful, so it's not worth banning under our philosophy for banning posts. In addition, I don't think that it's even true that a post about theology has to be off-topic. It's quite common on LW that people use replacement Gods like Omega for exploring thought experiments. Those discussions do pretend that "Omega existence is true" and that doesn't make them problematic in any way. Taking a more traditional God instead of Omega wouldn't be a problem. It's also even clear that theism has been proved irrational. In the census a significant portion allocates more than 0 percent to it being true. I think at the first Double Crux we did at LW Berlin someone updated in the direction of theism. A CFAR person did move to theism after an elaborate experiment of the Reverse Turing test. LW likely wouldn't have existed if it wouldn't be for the philanthropic efforts of a certain Evangelical Christian. David Chapman made in his posts about post-rationality the point that his investigation of religious ideas like Tantra allowed him to make advances in AI while at MIT that he likely otherwise wouldn't have made.
Actually neither of those are obvious to me.
0MrMind
That's a weird position to have: basically you're saying that there's no moral way to limit the topic of or the accessibility to a closed group. Am I representing you correctly? If not, where would you put the boundaries?
Those specific examples are bad examples. Gentlemen clubs are actually concentrations of power where informal deals happen. Admitting women to these institutions is vital to having gender equality at the highest echelons of civic power. And theology is discussed all the time on LW, even if it is often the subject of criticism. I was just saying that those particular examples were poorly chosen. But since you have me engaged here, the problem with taking an absolutive view is when a private communication medium, e.g. Facebook, becomes a medium of debate over civic issues. Somewhere along the way it becomes a public commons vital to democracy where matters of free speech must be protected. In some countries (not the USA) this is arguably already the case with Facebook.
I agree there is a big danger of slipping down the free speech slope if we fight too hard against fake news, but I also think we need to consider a (successful) campaign effort of another nation to undermine the legitimacy of our elections as an act of hostile aggression, and in times of war most people agree some measured limitation of free speech can be justified.
7Lumifer
You shouldn't uncritically ingest all the crap the media is feeding you. It's bad for your health. So we are at war with Russia? War serious enough to necessitate suspending the Constitution?
No, at least not yet. That's a good point. But Facebook is a private company, so filtering content that goes against their policy need not necessarily violate the constitution, right? I don't know the legal details, though, I could be completely wrong.
2Lumifer
Facebook can filter the content, yes, but we're not discussing the legalities, we're discussing whether this is a good idea.
5ChristianKl
All of the information submitted to Wikileaks was real. Even if it came from Russia it was nothing to do with Fake News.
5lmn
You know, your campaign against fake news might be taken slightly more seriously if you didn't immediately follow it up by asserting a piece of fake news as fact.
3skeptical_lurker
I've just been skimming the wiki page on Russian involvement in the US election. The other claims seem to just be that there was Russian propaganda. If propaganda and possible spying counts as "war" then we will always be at war, because there is always propaganda (as if the US doesn't do the same thing!). The parallels with 1984 go without saying, but I really think that the risk of totalitarianism isn't Trump, its people overreacting to Trump. Also, there are similar allegations of corruption between Clinton and Saudi Arabia.
6skeptical_lurker
Facebook is full of bullshit because it is far quicker to share something then to fact-check it, not that anyone cares about facts anyway. A viral alarmist meme with no basis in truth will be shared more then a boring, balanced view that doesn't go all out to fight the other tribe. But Facebook has always been full of bullshit and no-one cared until after the US election when everyone decided to pin Trump's victory on fake news. So its pretty clear that good epistemology is not the genuine concern here. Not that I'm saying that Facebook is worse then any other social media - the problem isn't Facebook, the problem is human nature.
2MrMind
"Arbiter of truth" is too big of a word. People easily forget two important things: 1. Facebook is a social media, emphasis on media: it allows the dissemination of content, it does not produce it; 2. Facebook is a private, for profit enterprise: it exists to generate a revenue, not to provide a service to citizens. Force 1 obviously acts against any censoring or control besides what is strictly illegal, but force 2 pushes for the creation of an environment that is customer friendly. That is the only reason why there is some form of control on the content published: because doing otherwise would lose customers. People are silly if they delegate the responsibility of verifying the truth of a content to the transport layer, and the only reason that a flag button is present is because doing otherwise would lose customers. That said, to answer your question: No, Facebook does not have any responsability beyond what is strictly illegal. That from power comes responsibility is a silly implication written in a comic book, but it's not true in real life (it's almost the opposite). As a general rule of life, do not acquire your facts from comics.
3Lumifer
Since we're talking about Facebook, it's worth reminding that the customers are the advertisers. All y'all are just the product being sold.
0MrMind
Right, the chain has one more step, but still: if people start unsubscribing from Facebook, then money goes elsewhere and so does advertisers.
1denimalpaca
"That from power comes responsibility is a silly implication written in a comic book, but it's not true in real life (it's almost the opposite). " Evidence? I 100% disagree with your claim. Looking at governments or business, the people with more power tend to have a lot of responsibility both to other people in the gov't/company and to the gov't/company itself. The only kind of power I can think of that doesn't come with some responsibility is gun ownership. Even Facebook's power of content distribution comes with a responsibility to monetize, which then has downstream responsibilities.
1MrMind
You're looking only at the walled garden of institutions inside a democracy. But if you look at past history, authoritarian governments or muddled legal situations (say some global corporations), you'll find out that as long as the structure of power is kept intact, people in power can do pretty much as they please with little or no backlash.
1ChristianKl
Half of the US voted for Trump. If Facebook would make a move that would censor a lot of pro-Trump lies it risks losing a significant portion of it's audience. I'm not sure whether the function of verifying the quality of news articles is best fulfilled by a traditional social network. If I would care to solve the problem I would build a browser plugin that provides quality ratings of articles and websites. Users can vote and there's a machine learning algorithm that translates the user votes into a good quality metric.
0Viliam
0Lumifer
Relevant: today's discussion on HN of how Facebook shapes the feeds on its platform and what do various people think about it.
0lmn
A better question is why should we trust Facebook to do so honestly, rather than abusing that power to declare lies that benefit Mark Zuckerberg to be "facts". Given the amount of ethics, or rather lack thereof, his actions have shown so far, I see very little reason to trust him.
0[anonymous]
A better question is why should we trust Facebook to do so honestly, rather than abusing that power to declare lies that benefit Mark Zuckerberg to be "facts". Given the amount of ethics, or rather lack thereof, his actions have shown so far, I see very little reason to trust him.
0DryHeap
They certainly do identify content, and indeed alter the way that certain messages are promoted. Example. Who decides what is and is not fake news?
1denimalpaca
Not quite what I meant about identifying content but fair point. As for fake news, the most reliable way to tell is whether the piece states information as verifiable fact, and if that fact is verified. Basically, there should be at least some sort of verifiable info in the article, or else it's just narrative. While one side's take may be "real" to half the world, the other side's take can be "real" to the other half of the world, but there should be some piece of actual information that both sides look at and agree is real.
1lmn
Verified by whom? There is a long history of "facts verified by official sources" turning out to be false.
0ChristianKl
That means if you have an investigative reporter with non-public sources, that's fake news because the other side has no access to his non-public sources?