TL;DR
This paper explores an exponential f(R) gravity model that explains cosmic acceleration without a cosmological constant, fitting observational constraints with minimal additional parameters.
Contribution
It introduces a novel exponential f(R) gravity model with a single extra parameter, providing a viable alternative to Lambda-CDM that satisfies solar system and cosmological constraints.
Findings
Model asymptotes to w=-1 without a cosmological constant
Fits matter power spectrum with a simple relation
Contains only one more parameter than LCDM
Abstract
We investigate a f(R) modification of gravity that is exponential in the Ricci scalar R to explain cosmic acceleration. The steepness of this dependence provides extra freedom to satisfy solar system and other curvature regime constraints. With a parameter to alleviate the usual fine tuning of having the modification strengthen near the present, the total number of parameters is only one more than LCDM. The resulting class of solutions asymptotes to w=-1 but has no cosmological constant. We calculate the dynamics in detail, examine the effect on the matter power spectrum, and provide a simple fitting form relating the two.
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