Gravity as a diffeomorphism-invariant gauge theory
Gravity as a diffeomorphism-invariant gauge theory
A general diffeomorphism-invariant SU(2) gauge theory is a gravity theory with two propagating polarizations of the graviton. We develop this description of gravity, in particular, for future applications to the perturbative quantization. Thus, the linearized theory, gauge symmetries, and gauge fixing are discussed in detail, and the propagator is obtained. …