Dark energy in modified Gauss-Bonnet gravity: Late-time acceleration and the hierarchy problem
- Dipartimento di Fisica, Universita di Trento and Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento (Italy)
- Consejo Superior de Investigaciones Cientificas (ICE/CSIC) and Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Fac Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra, Barcelona (Spain)
- Department of Applied Physics, National Defense Academy, Hashirimizu, Yokosuka 239-8686 (Japan)
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.
- OSTI ID:
- 20782906
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 8; Other Information: DOI: 10.1103/PhysRevD.73.084007; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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