Expanding universes in the conformal frame of $f(R) $ gravity

Details Expanding universes in the conformal frame of $f(R) $ gravity Expanding universes in the conformal frame of $f(R) $ gravity

2010-01-09

arxiv.org/abs/1001.1437v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Talk given in "The Invisible Universe", June 29 - July 3, 2009, Paris

Scientific paper

The late time evolution of Friedmann-Robertson-Walker (FRW) models with a perfect fluid matter source is studied in the conformal frame of $f(R) $ gravity. We assume that the corresponding scalar field, nonminimally coupled to matter, has an arbitrary non-negative potential function $V(\phi) $. We prove that equilibria corresponding to non-negative local minima for $V$ are asymptotically stable. We investigate all cases where one of the matter components eventually dominates. The results are valid for a large class of non-negative potentials without any particular assumptions about the behavior of the potential at infinity. In particular for a nondegenerate minimum of the potential with zero critical value we show that if $\gamma $, the parameter of the equation of state is larger than one, then there is a transfer of energy from the fluid to the scalar field and the later eventually dominates.

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