Matter bispectrum in cubic Galileon cosmologies
Cosmology and Nongalactic Astrophysics
2013-11-20 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
In this paper we obtain the bispectrum of dark matter density perturbations in the frame of covariant cubic Galileon theories. This result is obtained by means of a semi-analytic approach to second-order perturbations in Galileon cosmologies, assuming Gaussian initial conditions. In particular, we show that, even in the presence of large deviations of the linear growth-rate w.r.t. the {\Lambda}CDM one, at the bispectrum level such deviations are reduced to a few percent.
Cite
@article{arxiv.1301.4831,
title = {Matter bispectrum in cubic Galileon cosmologies},
author = {Nicola Bartolo and Emilio Bellini and Daniele Bertacca and Sabino Matarrese},
journal= {arXiv preprint arXiv:1301.4831},
year = {2013}
}
Comments
38 pages, 8 figures. Minor changes. References added. Published version