Equation of state for dark energy in f(T) gravity

2010/11/30 by Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee +1 · 1 citation
Physics and Astronomy · #astro-ph.CO #gr-qc

paper · pdf · doi:10.1088/1475-7516/2011/01/021

published as JCAP 1101:021,2011 · 24 pages, 12 figures, version accepted for publication in JCAP

arxiv created 2011/01/10 · arxiv updated 2015/03/17

Abstract

We study the cosmological evolutions of the equation of state for dark energy w_DE in the exponential and logarithmic as well as their combination f(T) theories. We show that the crossing of the phantom divide line of w_DE = -1 can be realized in the combined f(T) theory even though it cannot be in the exponential or logarithmic f(T) theory. In particular, the crossing is from w_DE > -1 to w_DE < -1, in the opposite manner from f(R) gravity models. We also demonstrate that this feature is favored by the recent observational data.

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