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Cosmological perturbations in theories with non-minimal coupling between curvature and matter

2013; Institute of Physics; Volume: 2013; Issue: 05 Linguagem: Inglês

10.1088/1475-7516/2013/05/029

1475-7516

Orfeu Bertolami, Pedro Frazão, Jorge Páramos,

Advanced Differential Geometry Research

In this work, one examines how the presence of a non-minimal coupling between the spacetime curvature and matter affects the evolution of cosmological perturbations around a homogeneous and isotropic Universe and hence the formation of large-scale structure. This framework places constraints on the terms which arise due to the coupling with matter and, in particular, on the modification in the growth of matter density perturbations. One obtains approximate analytical solutions for the evolution of matter overdensities during the matter dominated era and shows that these favor the presence of a coupling function that is compatible with the late-time cosmic acceleration.