Gradient expansion(s) and dark energy
Astrophysics
2009-11-13 v2
Abstract
Motivated by recent claims stating that the acceleration of the present Universe is due to fluctuations with wavelength larger than the Hubble radius, we present a general analysis of various perturbative solutions of fully inhomogeneous Einstein equations supplemented by a perfect fluid. The equivalence of formally different gradient expansions is demonstrated. If the barotropic index vanishes, the deceleration parameter is always positive semi-definite.
Cite
@article{arxiv.astro-ph/0506715,
title = {Gradient expansion(s) and dark energy},
author = {Massimo Giovannini},
journal= {arXiv preprint arXiv:astro-ph/0506715},
year = {2009}
}
Comments
17 pages, no figures