Speaker
Description
I will discuss the cosmology of a brane-world realization of massive gravity. The theory, known as warped massive gravity, postulates the existence of dRGT potentials in the 5D bulk and in the 4D brane, and has the virtue of raising the strong-coupling scale of the 4D theory. Although generically the 4D dynamics cannot be decoupled from the bulk equations, we identify, in the cosmological context, two classes of models that lead to decoupled equations for the scale factor on the brane. The first model is peculiar because it is not described by a Friedmann-type equation, and accommodates interesting solutions including bounces without exotic matter. The second class leads to a generalization of the DGP model equation, and a preliminary analysis shows the potential of the theory to alleviate the Hubble tension.
