期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 7, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2013/07/034
关键词
modified gravity; dark energy theory
资金
- MINECO (Spain) [PR2011-0128, FIS2010-15640]
- CPAN Consolider Ingenio Project
- AGAUR (Generalitat de Catalunya) [2009SGR-994]
- RFBR [11-01-00894, 12-02-31109]
- Russian Ministry of Education and Science [NSh-3920.2012.2, CPAN10-PD12]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- JSPS [21244033]
A nonlocal gravity model which does not assume the existence of a new dimensional parameter in the action and includes a function f(square(-1) R), with square the d'Alembertian operator, is studied. By specifying an exponential form for the function f and including a matter sector with a constant equation of state parameter, all available power-law solutions in the Jordan frame are obtained. New power-law solutions in the Einstein frame are also probed. Furthermore, the relationship between power-law solutions in both frames, established through conformal transformation, is substantially clarified. The correspondence between power-law solutions in these two frames is proven to be a very useful tool in order to obtain new solutions in the Einstein frame.
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