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Cited by 221

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Exponential gravity

Open access
Linder, Eric V.·2009·Physical Review D
DOI 10.1103/physrevd.80.123528
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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 $\ensuremath{\Lambda}\mathrm{CDM}$. The resulting class of solutions asymptotes to $w=\ensuremath{-}1$ 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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Metadata

Authors
Linder, E. V.
Venue
Physical Review D
Publisher
American Physical Society (APS)
Published
2009-12-23
Volume
80
Issue
12
ISSN
  • 0556-2821 (ISSN-L)
  • 1550-7998
  • 1550-2368
DOI
10.1103/physrevd.80.123528
OpenAlex
W3037555178
Cited by
221
References
0
FWCI
7.88
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Exponential gravity. https://app.cochat.ai/papers/10.1103/physrevd.80.123528
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Linder, E. V. (2009). Exponential gravity. Physical Review D. https://doi.org/10.1103/physrevd.80.123528

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