Fine tuning in quintessence models with exponential potentials

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dc.contributor.authorFrança, Urbano [UNESP]
dc.contributor.authorRosenfeld, Rogério [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:20:30Z
dc.date.available2014-05-27T11:20:30Z
dc.date.issued2002-10-01
dc.description.abstractWe explore regions of parameter space in a simple exponential model of the form V = V0 e-λ(Q/Mp) that are allowed by observational constraints. We find that the level of fine tuning in these models is not different from more sophisticated models of dark energy. We study a transient regime where the parameter λ has to be less than √3 and the fixed point ΩQ = 1 has not been reached. All values of the parameter λ that lead to this transient regime are permitted. We also point out that this model can accelerate the universe today even for λ > √2, leading to a halt of the present acceleration of the universe in the future thus avoiding the horizon problem. We conclude that this model can not be discarded by current observations. © SISSA/ISAS 2002.en
dc.description.affiliationInstituto de Física Teórica UNESP, Rua Pamplona, 145, 01405-900 São Paulo, SP
dc.description.affiliationUnespInstituto de Física Teórica UNESP, Rua Pamplona, 145, 01405-900 São Paulo, SP
dc.format.extent315-329
dc.identifierhttp://dx.doi.org/10.1088/1126-6708/2002/10/015
dc.identifier.citationJournal of High Energy Physics, v. 6, n. 10, p. 315-329, 2002.
dc.identifier.doi10.1088/1126-6708/2002/10/015
dc.identifier.issn1029-8479
dc.identifier.scopus2-s2.0-4744345726
dc.identifier.urihttp://hdl.handle.net/11449/66982
dc.identifier.wosWOS:000180552900015
dc.language.isoeng
dc.relation.ispartofJournal of High Energy Physics
dc.relation.ispartofjcr5.541
dc.relation.ispartofsjr1,227
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCosmology of Theories beyond the SM
dc.subjectPhysics of the Early Universe
dc.titleFine tuning in quintessence models with exponential potentialsen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/page/copyright
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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