The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry

Details The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry

2006-10-04

arxiv.org/abs/astro-ph/0610125v1

Phys.Rev.D75:044014,2007

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1103/PhysRevD.75.044014

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.

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