English

Cosmological evolution in exponential gravity

Cosmology and Nongalactic Astrophysics 2010-09-10 v3 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

We explore the cosmological evolution in the exponential gravity f(R)=R+c1(1ec2R)f(R)=R +c_1 (1-e^{- c_2 R}) (c1,2=constantc_{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.

Keywords

Cite

@article{arxiv.1005.4574,
  title  = {Cosmological evolution in exponential gravity},
  author = {Kazuharu Bamba and Chao-Qiang Geng and Chung-Chi Lee},
  journal= {arXiv preprint arXiv:1005.4574},
  year   = {2010}
}

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Published version in JCAP

R2 v1 2026-06-21T15:27:31.517Z