Dark Energy versus Modified Gravity

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dc.creatorKunz, Martin
dc.creatorSapone, Domenico
dc.date2006-12-17
dc.date.accessioned2026-07-07T10:36:42Z
dc.date.available2026-07-07T10:36:42Z
dc.descriptionThere is now strong observational evidence that the expansion of the universe is accelerating. The standard explanation invokes an unknown "dark energy" component. But such scenarios are faced with serious theoretical problems, which has led to increased interest in models where instead General Relativity is modified in a way that leads to the observed accelerated expansion. The question then arises whether the two scenarios can be distinguished. Here we show that this may not be so easy, demonstrating explicitely that a generalised dark energy model can match the growth rate of the DGP model and reproduce the 3+1 dimensional metric perturbations. Cosmological observations are then unable to distinguish the two cases.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0612452
dc.identifierhttp://arxiv.org/abs/astro-ph/0612452
dc.identifierPhys.Rev.Lett.98:121301,2007
dc.identifierdoi:10.1103/PhysRevLett.98.121301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180142
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDark Energy versus Modified Gravity
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