Phys. Rev. D 73, 084007 (2006) [16 pages]
Dark energy in modified Gauss-Bonnet gravity: Late-time acceleration and the hierarchy problem
Abstract
References (38)
Citing Articles
Guido Cognola, 1 Emilio Elizalde, 2 Shin'ichi Nojiri, 3 Sergei D. Odintsov, 2,4 and Sergio Zerbini11Dipartimento di Fisica, Università di Trento and Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, Italy
2Consejo Superior de Investigaciones Científicas (ICE/CSIC) and Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Fac Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra (Barcelona), Spain
3Department of Applied Physics, National Defense Academy, Hashirimizu, Yokosuka 239-8686, Japan
4ICREA, Barcelona, Spain, and Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Fac Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra (Barcelona), Spain
Received 31 December 2005; published 6 April 2006
Dark energy cosmology is considered in a modified Gauss-Bonnet (GB) model of gravity where an arbitrary function of the GB invariant, f(G), is added to the general relativity action. We show that a theory of this kind is endowed with a quite rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence, or phantom cosmic acceleration, with a possibility for the transition from deceleration to acceleration. It is demonstrated in the paper that this theory is perfectly viable, since it is compliant with the solar system constraints. Specific properties of f(G) gravity in a de Sitter (dS) universe, such as dS and SdS solutions, their entropy, and its explicit one-loop quantization are studied. The issue of a possible solution of the hierarchy problem in modified gravities is also addressed.
©2006 The American Physical Society
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