Tuesday, February 21, 2012

1202.4317 (Kazuharu Bamba)

Equation of State for Dark Energy in Modified Gravity Theories    [PDF]

Kazuharu Bamba
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.
View original: http://arxiv.org/abs/1202.4317

No comments:

Post a Comment