Journal
PHYSICS LETTERS B
Volume 679, Issue 4, Pages 302-305Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2009.07.003
Keywords
Cosmic acceleration; Modified gravity; Gauss-Bonnet term; Tachyon field
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Modified Gauss-Bonnet, i.e., f(G) gravity is a possible explanation of dark energy. Late time cosmology for the f(G) gravity non-minimally coupled with a free massless scalar field have been investigated in Ref. [S. Nojiri, S.D. Odintsov, RV. Tretyakov, Phys. Lett. B 651 (2007) 224, arXiv:0704.2520 [hep-th]: S. Nojiri, S.D. Odintsov, P.V. Tretyakov, Progr. Theor. Phys. Suppl. 172 (2008) 81, arXiv:0710.5232]. In this Letter we generalize the work of Ref. [S. Nojiri, S.D. Odintsov, RV. Tretyakov, Phys. Lett. B 651 (2007) 224, arXiv:0704.2520 [hep-th]; S. Nojiri, S.D. Odintsov, P.V. Tretyakov, Progr. Theor. Phys. Suppl. 172 (2008) 81, arXiv:0710.5232] by including scalar potential in the matter Lagrangian which is non-minimally coupled with modified Gauss-Bonnet gravity. Also we obtain the conditions for having a much more amazing problem than the acceleration of the universe, i.e. crossing of omega = -1, in f(G) non-minimally coupled with tachyonic Lagrangian. (C) 2009 Published by Elsevier B.V.
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