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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:1301.4831 (astro-ph)
[Submitted on 21 Jan 2013 (v1), last revised 3 May 2013 (this version, v2)]

Title:Matter bispectrum in cubic Galileon cosmologies

Authors:Nicola Bartolo, Emilio Bellini, Daniele Bertacca, Sabino Matarrese
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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.
Comments: 38 pages, 8 figures. Minor changes. References added. Published version
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1301.4831 [astro-ph.CO]
  (or arXiv:1301.4831v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.1301.4831
Journal reference: JCAP03(2013)034
Related DOI: https://doi.org/10.1088/1475-7516/2013/03/034

Submission history

From: Emilio Bellini [view email]
[v1] Mon, 21 Jan 2013 11:58:32 UTC (2,142 KB)
[v2] Fri, 3 May 2013 16:03:05 UTC (2,142 KB)
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