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Phys. Rev. D 68, 123512 (2003) [10 pages]

Modified gravity with negative and positive powers of curvature: Unification of inflation and cosmic acceleration

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Shin’ichi Nojiri*
Department of Applied Physics, National Defence Academy, Hashirimizu Yokosuka 239-8686, Japan

Sergei D. Odintsov†
Institut d’Estudis Espacials de Catalunya (IEEC), Edifici Nexus, Gran Capità 2-4, 08034 Barcelona, Spain
Instituciò Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain

Received 30 July 2003; published 15 December 2003

A modified gravity, which eliminates the need for dark energy and which seems to be stable, is considered. The terms with positive powers of curvature support the inflationary epoch while the terms with negative powers of curvature serve as effective dark energy, supporting current cosmic acceleration. The equivalent scalar-tensor gravity may be compatible with the simplest solar system experiments.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.123512
DOI:
10.1103/PhysRevD.68.123512
PACS:
98.80.-k, 04.50.+h, 11.10.Kk, 11.10.Wx

*Electronic addresses: nojiri@nda.ac.jp, snojiri@yukawa.kyoto-u.ac.jp

†Also at TSPU, Tomsk, Russia. Electronic address: odintsov@ieec.fcr.es

 
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