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Matter bispectrum in cubic Galileon cosmologies

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arxiv 1301.4831 v2 pith:73LQU3WF submitted 2013-01-21 astro-ph.CO gr-qchep-ph

classification astro-ph.COgr-qchep-ph
keywords bispectrumgalileoncosmologiescubicdeviationsmatterperturbationsapproach
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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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