Equation of State for Dark Energy in Modified Gravity Theories

Details Equation of State for Dark Energy in Modified Gravity Theories Equation of State for Dark Energy in Modified Gravity Theories

2012-02-20

arxiv.org/abs/1202.4317v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, no figure, contribution to KMI Inauguration Conference "Quest for the Origin of Particles and the Universe" (KMIIN),

Scientific paper

We explore the equation of state (EoS) for dark energy $w_{\mathrm{DE}}$ in modified gravitational theories to explain the current accelerated expansion of the universe. We explicitly demonstrate that the future crossings of the phantom divide line of $w_{\mathrm{DE}}=-1$ are the generic feature in the existing viable $f(R)$ gravity models. Furthermore, we show that the crossing of the phantom divide can be realized in the combined $f(T)$ theory constructed with the exponential and logarithmic terms. In addition, we investigate the effective EoS for the universe when the finite-time future singularities occur in non-local gravity.

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