Matter bispectrum in cubic Galileon cosmologies
Date
2013Author
Bartolo, Nicola
Bellini, Emilio
Bertacca, Daniele
Matarrese, Sabino
Metadata
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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 CDM one, at the bispectrum level such deviations are reduced
to a few percent.