View : 689 Download: 233
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
- 1550-7998
- Citation
- Physical Review D - Particles, Fields, Gravitation and Cosmology vol. 80, no. 12
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- 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
- Files in This Item:
-
Exponential gravity.pdf(295.04 kB)
Download
- Export
- RIS (EndNote)
- XLS (Excel)
- XML