期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/03/034
关键词
modified gravity; power spectrum; dark energy theory
资金
- ASI/INAF [I/072/09/0]
- PRIN project La Ricerca di non-Gaussianita Primordiale
- South African Square Kilometre Array Project
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.
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