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Constraints on Gauss-Bonnet gravity in dark energy cosmologies

Luca Amendola, Christos Charmousis and Stephen C. Davis

Models with a scalar field coupled to the Gauss-Bonnet Lagrangian appear naturally from Kaluza-Klein compactifications of pure higher-dimensional gravity. We study linear, cosmological perturbations in the limits of weak coupling and slow-roll, and derive simple expressions for the main observable s... Full description

Main Author: Amendola, Luca
Contributors: Charmousis, Christos | Author
Davis, Stephen C. | Author
Published: 22 December 2006
Contained in: Journal of cosmology and astroparticle physics London : IOP, 2003 (2007,8) Artikel-Nummer 020, 16 Seiten
Journal Title: Journal of cosmology and astroparticle physics
Fulltext access:
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Links: Volltext (dx.doi.org)
Volltext (stacks.iop.org)
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2006/12/020
Regional Holdings: TIB – German National Library of Science and Technology
Physikalisch-Technische Bundesanstalt
Language: English
Notes: Gesehen am 15.11.2017
Physical Description: 16
ID (e.g. DOI, URN): 10.1088/1475-7516/2006/12/020
PPN (Catalogue-ID): 1565370716
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520 |a Models with a scalar field coupled to the Gauss-Bonnet Lagrangian appear naturally from Kaluza-Klein compactifications of pure higher-dimensional gravity. We study linear, cosmological perturbations in the limits of weak coupling and slow-roll, and derive simple expressions for the main observable sub-horizon quantities: the anisotropic stress factor, the time-dependent gravitational constant, and the matter perturbation growth factor. Using present observational data, and assuming slow-roll for the dark energy field, we find that the fraction of energy density associated with the coupled Gauss-Bonnet term cannot exceed 15%. The bound should be treated with caution, as there are significant uncertainties in the data used to obtain it. Even so, it indicates that the future prospects for constraining the coupled Gauss-Bonnet term with cosmological observations are encouraging. 
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