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Cosmological evolution in f(R) gravity and a logarithmic model | | Jun-Qi Guo
; Andrei V. Frolov
; | | Date: |
31 May 2013 | | Abstract: | In this paper, we revisit the conditions for cosmological viability of f(R)
gravity and formulate them in terms of constraints on the potential of the
scalaron field f’. When the scalaron is heavy, f(R) goes to general relativity,
and the matter-domination epoch could last long enough to ensure the formation
of the large scale structure. The idea of having the Newton’s constant change
its value depending on the scalar curvature leads to a class of f(R) models. In
particular, one obtains an RlnR model when the running of a dimensionless
coupling constant is described by a beta-function similar to the one in quantum
chromodynamics. In this RlnR model, the effective cosmological constant is
exponentially suppressed compared to a reference scale. We explore the phase
space dynamics and the cosmological evolution of the model in details. | | Source: | arXiv, 1305.7290 | | Services: | Forum | Review | PDF | Favorites | |
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