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OKC - Theory Working Group

The Cosmology of Massive Bigravity

by Adam R. Solomon (University of Pennsylvania)

132.028 (Nordita main/east building) ()

132.028 (Nordita main/east building)

Theories of a massive graviton are promising candidates to explain the accelerating expansion of the Universe, in addition to holding significant intrinsic theoretical interest. The bimetric theory of massive gravity in particular has a wealth of cosmological solutions which could describe our Universe. In the first half of the talk, I will introduce bimetric massive gravity and its cosmologies. In the second half, I will discuss the subtleties associated with understanding cosmological perturbation theory in bigravity due to the complicated nonlinear behavior of the helicity-0 mode of the massive graviton.