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20 April 2024

» arxiv » astro-ph/0610125

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The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry
P. G. Ferreira ; B. M. Gripaios ; R. Saffari ; T. G. Zlosnik ; PostScript ; PDF ; Other formats ; SLAC-SPIRES HEP ; to ; by ;
Date:	4 Oct 2006
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.
Source:	arXiv, astro-ph/0610125
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