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Abstract: We investigate a fR modification of gravity that is exponential in theRicci scalar R to explain cosmic acceleration. The steepness of this dependenceprovides extra freedom to satisfy solar system and other curvature regimeconstraints. With a parameter to alleviate the usual fine tuning of having themodification strengthen near the present, the total number of parameters isonly one more than LCDM. The resulting class of solutions asymptotes to w=-1but has no cosmological constant. We calculate the dynamics in detail, examinethe effect on the matter power spectrum, and provide a simple fitting formrelating the two.

Author: Eric V. Linder

Source: https://arxiv.org/

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