Cosmic Expansion in Extended Quasidilaton Massive Gravity
Abstract
Quasidilaton massive gravity offers a physically well-defined gravitational theory with non-zero graviton mass. We present the full set of dynamical equations governing the expansion history of the universe, valid during radiation domination, matter domination, and a late-time self-accelerating epoch related to the graviton mass. The existence of self-consistent solutions constrains the amplitude of the quasi-dilaton field and the graviton mass, as well as other model parameters. We point out that the effective mass of gravitational waves can be significantly larger than the graviton mass, opening the possibility that a single theory can explain both the late-time acceleration of the cosmic expansion and modifications of structure growth leading to the suppression of large-angle correlations observed in the cosmic microwave background.
Cite
@article{arxiv.1412.4300,
title = {Cosmic Expansion in Extended Quasidilaton Massive Gravity},
author = {Tina Kahniashvili and Arjun Kar and George Lavrelashvili and Nishant Agarwal and Lavinia Heisenberg and Arthur Kosowsky},
journal= {arXiv preprint arXiv:1412.4300},
year = {2019}
}
Comments
5 pages, 1 figure; eq. 7 corrected - conclusions have not changed