The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry
Astrophysics
2008-11-26 v1
Abstract
A self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the time-like direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse and tracking.
Keywords
Cite
@article{arxiv.astro-ph/0610125,
title = {The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry},
author = {P. G. Ferreira and B. M. Gripaios and R. Saffari and T. G. Zlosnik},
journal= {arXiv preprint arXiv:astro-ph/0610125},
year = {2008}
}