Tuesday, February 19, 2013

1302.4330 (Emilio Elizalde et al.)

Cosmological Solutions of a Nonlocal Model with a Perfect Fluid    [PDF]

Emilio Elizalde, Ekaterina O. Pozdeeva, Sergey Yu. Vernov, Ying-li Zhang
A nonlocal gravity model which does not assume the existence of a new dimensional parameter in the action and includes a function $f(\Box^{-1} R)$, with $\Box$ the d'Alembertian operator, is studied. By specifying an exponential form for the function f and including a matter sector with a constant equation of state parameter, all available power-law solutions in the Jordan frame are obtained. New power-law solutions in the Einstein frame are also probed. Furthermore, the relationship between power-law solutions in both frames, established through conformal transformation, is substantially clarified. The correspondence between power-law solutions in these two frames is proven to be a very useful tool in order to obtain new solutions in the Einstein frame.
View original: http://arxiv.org/abs/1302.4330

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