Observational Bounds on Modified Gravity Models

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dc.creatorDe Felice, Antonio
dc.creatorMukherjee, Pia
dc.creatorWang, Yun
dc.date2007-06-08
dc.date.accessioned2026-07-07T11:16:43Z
dc.date.available2026-07-07T11:16:43Z
dc.descriptionModified gravity provides a possible explanation for the currently observed cosmic accelaration. In this paper, we study general classes of modified gravity models. The Einstein-Hilbert action is modified by using general functions of the Ricci and the Gauss-Bonnet scalars, both in the metric and in the Palatini formalisms. We do not use an explicit form for the functions, but a general form with a valid Taylor expansion up to second order about redshift zero in the Riemann-scalars. The coefficients of this expansion are then reconstructed via the cosmic expansion history measured using current cosmological observations. These are the quantities of interest for theoretical considerations relating to ghosts and instabilities. We find that current data provide interesting constraints on the coefficients. The next-generation dark energy surveys should shrink the allowed parameter space for modifed gravity models quite dramatically.
dc.description23 pages, 5 figures, uses RevTeX
dc.identifierhttps://arxiv.org/abs/0706.1197
dc.identifierhttp://arxiv.org/abs/0706.1197
dc.identifierPhys.Rev.D77:024017,2008
dc.identifierdoi:10.1103/PhysRevD.77.024017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192770
dc.subjectAstrophysics
dc.titleObservational Bounds on Modified Gravity Models
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