Cosmological evolution in exponential gravity

Details Cosmological evolution in exponential gravity Cosmological evolution in exponential gravity

2010-05-25

arxiv.org/abs/1005.4574v3

JCAP08(2010)021

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Published version in JCAP

Scientific paper

10.1088/1475-7516/2010/08/021

We explore the cosmological evolution in the exponential gravity $f(R)=R +c_1 (1-e^{- c_2 R})$ ($c_{1, 2} = \mathrm{constant}$). We summarize various viability conditions and explicitly demonstrate that the late-time cosmic acceleration following the matter-dominated stage can be realized. We also study the equation of state for dark energy and confirm that the crossing of the phantom divide from the phantom phase to the non-phantom (quintessence) one can occur. Furthermore, we illustrate that the cosmological horizon entropy globally increases with time.

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