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Exponential gravity

Title
Exponential gravity
Authors
Linder E.V.
Ewha Authors
Eric V. Linder
Issue Date
2009
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 80, no. 12
Indexed
SCI; SCIE; SCOPUS WOS scopus
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 ΛCDM. 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. © 2009 The American Physical Society.
DOI
10.1103/PhysRevD.80.123528
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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