Cosmological Consequences of Exponential Gravity in Palatini Formalism

Details Cosmological Consequences of Exponential Gravity in Palatini Formalism Cosmological Consequences of Exponential Gravity in Palatini Formalism

2010-12-17

arxiv.org/abs/1012.3943v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, 1 table, LaTeX

Scientific paper

We investigate cosmological consequences of a class of exponential $f(R)$ gravity in the Palatini formalism. By using the current largest type Ia Supernova sample along with determinations of the cosmic expansion at intermediary and high-$z$ we impose tight constraints on the model parameters. Differently from other $f(R)$ models, we find solutions of transient acceleration, in which the large-scale modification of gravity will drive the Universe to a new decelerated era in the future. We also show that a viable cosmological history with the usual matter-dominated era followed by an accelerating phase is predicted for some intervals of model parameters.

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