Gravitational potential evolution in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
Cosmology and Nongalactic Astrophysics
2012-08-14 v1 General Relativity and Quantum Cosmology
Abstract
We investigate the time evolution of the gravitational potential Phi for a special class of non-adiabatic Unified Dark matter Models described by scalar field lagrangians. These models predict the same background evolution as in the LambdaCDM and possess a non-vanishing speed of sound. We provide a very accurate approximation of Phi, valid after the recombination epoch, in the form of a Bessel function of the first kind. This approximation may be useful for a future deeper analysis of Unified Dark Matter scalar field models.
Keywords
Cite
@article{arxiv.1103.0234,
title = {Gravitational potential evolution in Unified Dark Matter Scalar Field Cosmologies: an analytical approach},
author = {Oliver F. Piattella and Daniele Bertacca},
journal= {arXiv preprint arXiv:1103.0234},
year = {2012}
}
Comments
5 pages, 6 figures