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Phys. Rev. D 71, 123509 (2005) [7 pages]

Gauss-Bonnet dark energy

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

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

Misao Sasaki‡
Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

Received 6 April 2005; revised 26 May 2005; published 7 June 2005

We propose the Gauss-Bonnet dark energy model inspired by string/M-theory where standard gravity with scalar contains additional scalar-dependent coupling with a Gauss-Bonnet invariant. It is demonstrated that the effective phantom (or quintessence) phase of the late universe may occur in the presence of such a term when the scalar is phantom or for nonzero potential (for canonical scalar). However, with the increase of the curvature, the Gauss-Bonnet term may become dominant so that the phantom phase is transient and the w=-1 barrier may be passed. Hence, the current acceleration of the universe may be caused by a mixture of scalar phantom and/or potential or stringy effects. It is remarkable that scalar-Gauss-Bonnet coupling acts against the big rip occurrence also in phantom cosmology.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.123509
DOI:
10.1103/PhysRevD.71.123509
PACS:
98.70.Vc

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

†Also at Laboratory for Fundamental Studies, Tomsk State Pedagogical University, 634041 Tomsk, Russia.

Electronic address: odintsov@ieec.fcr.es

‡Electronic address: misao@yukawa.kyoto-u.ac.jp

 
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