Accelerating Cosmologies with an Anisotropic Equation of State
Astrophysics
2010-11-11 v3 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
If the dark energy equation of state is anisotropic, the expansion rate of the universe becomes direction-dependent at late times. We show that such models are not only cosmologically viable but that they could explain some of the observed anomalies in the CMB, and shed some light into the coincidence problem. The possible anisotropy can then be constrained by studying its effects on the luminosity distance-redshift relation inferred from several observations. A vector field action for dark energy is also presented as an example of such possibility.
Keywords
Cite
@article{arxiv.0707.0279,
title = {Accelerating Cosmologies with an Anisotropic Equation of State},
author = {Tomi Koivisto and David F. Mota},
journal= {arXiv preprint arXiv:0707.0279},
year = {2010}
}
Comments
5 pages, 4 figures. Further details on Bianchi models and several explanations and references added