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Generic feature of future crossing of phantom divide in viable $f(R)$ gravity models

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arxiv 1007.0482 v2 pith:MQJXDYTZ submitted 2010-07-03 astro-ph.CO gr-qchep-th

classification astro-ph.COgr-qchep-th
keywords futurecosmologicalgravitymodelsviabledivideentropyfeature
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abstract

We study the equation of state for dark energy and explicitly demonstrate that the future crossings of the phantom divide line $w_{\mathrm{DE}}=-1$ are the generic feature in the existing viable $f(R)$ gravity models. We also explore the future evolution of the cosmological horizon entropy and illustrate that the cosmological horizon entropy oscillates with time due to the oscillatory behavior of the Hubble parameter. The important cosmological consequence is that in the future, the sign of the time derivative of the Hubble parameter changes from negative to positive in these viable $f(R)$ gravity models.

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Cited by 1 Pith paper

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  1. Rotating and non-rotating AdS black holes in $f({\cal T})$ gravity non-linear electrodynamics

    gr-qc 2019-08 conditional novelty 4.0 of 10

    New charged AdS black hole solutions are constructed for quadratic f(T) gravity with a specific nonlinear electrodynamics source, generalizing earlier Maxwell solutions and producing entropy that deviates from the area law.

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