A detailed analysis of structure growth in f(R) theories of gravity
release_krfajdlxzvevxcoctnile5zhkm
by
Kishore N. Ananda, Sante Carloni, Peter K. S. Dunsby
2008
Abstract
We investigate the connection between dark energy and fourth order gravity by
analyzing the behavior of scalar perturbations around a
Friedmann-Robertson-Walker background. The evolution equations for scalar
perturbation are derived using the covariant and gauge invariant approach and
applied to two widely studied f(R) gravity models. The structure of the
general fourth order perturbation equations and the analysis of scalar
perturbations lead to the discovery of a characteristic signature of fourth
order gravity in the matter power spectrum, the details of which have not seen
before in other works in this area. This could provide a crucial test for
fourth order gravity on cosmological scales.
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