Cosmological Large-scale Structures beyond Linear Theory in Modified Gravity

Details Cosmological Large-scale Structures beyond Linear Theory in Modified Gravity Cosmological Large-scale Structures beyond Linear Theory in Modified Gravity

2011-02-09

arxiv.org/abs/1102.1907v1

JCAP 1106:019,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

25 pages, 11 figures

Scientific paper

10.1088/1475-7516/2011/06/019

We consider the effect of modified gravity on the growth of large-scale structures at second order in perturbation theory. We show that modified gravity models changing the linear growth rate of fluctuations are also bound to change, although mildly, the mode coupling amplitude in the density and reduced velocity fields. We present explicit formulae which describe this effect. We then focus on models of modified gravity involving a scalar field coupled to matter, in particular chameleons and dilatons, where it is shown that there exists a transition scale around which the existence of an extra scalar degree of freedom induces significant changes in the coupling properties of the cosmic fields. We obtain the amplitude of this effect for realistic dilaton models at the tree-order level for the bispectrum, finding them to be comparable in amplitude to those obtained in the DGP model.

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