Phys. Rev. D 73, 043512 (2006) [16 pages]
Observational constraints on dark energy with generalized equations of state
Abstract
References (55)
Citing Articles
S. Capozziello, 1 V. F. Cardone, 2 E. Elizalde, 3 S. Nojiri, 4 and S. D. Odintsov31Dipartimento di Scienze Fisiche, Università di Napoli "Federico II", Italy and INFN, Sez. di Napoli, Compl. Univ. Monte S. Angelo, Edificio N, Via Cinthia, I-80126, Napoli, Italy
2Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, Italy and INFN, Sez. di Napoli, Via S. Allende, I-84081, Baronissi (Salerno), Italy
3Instituciò Catalana de Recerca i Estudis Avançats (ICREA), Spain and Institut d' Estudis Espacials de Catalunya (IEEC/ICE), Edifici Nexus, Gran Capità 2-4, 08034 Barcelona, Spain
4Department of Applied Physics, National Defence Academy, Hashirimizu Yokosuka 239-8686, Japan
Received 16 August 2005; revised 23 November 2005; published 17 February 2006
We investigate the effects of viscosity terms depending on the Hubble parameter and its derivatives in the dark energy equation of state. Such terms are possible if dark energy is a fictitious fluid originating from corrections to the Einstein general relativity as is the case for some braneworld inspired models or fourth order gravity. We consider two classes of models whose singularities in the early and late time universe have been studied by testing the models against the dimensionless coordinate distance to Type Ia Supernovae and radio galaxies also including priors on the shift and the acoustic peak parameters. It turns out that both models are able to explain the observed cosmic speed up without the need of phantom (w<-1) dark energy.
©2006 The American Physical Society
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