Specifically, Brennan's error is assuming that you need a new theory to account for this. In fact, there is only one possible spin-2 particle in quantum field theory and it is the graviton. Physicists actually accidentally rediscovered GR in the 50's because of this.

Specifically, Brennan's error is assuming that you need a new theory to account for this. In fact, there is only one possible spin-2 particle in quantum field theory and it is the graviton. Physicists actually accidentally rediscovered GR in the 50's because of this.