Exponential Gravity

By Eric Linder. 2009

171 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e62e0f125ff1a1a1b027f8d28453ecad3fa2ce1c

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Inflationary Cosmology in Modified Gravity Theories (2015, background): “We consider the case that f(R) is given by an exponential form [49,50,81]”
f(R) Theories (2010, background): “95) 5 The cosmological dynamics for the model f(R) = R− μRc [1− exp(−2R/Rc)] was studied in [396].”