Fine tuning in quintessence models with exponential potentials

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorFrança, Urbano
dc.creatorRosenfeld, Rogério
dc.date2014-05-27T11:20:30Z
dc.date2016-10-25T18:17:59Z
dc.date2014-05-27T11:20:30Z
dc.date2016-10-25T18:17:59Z
dc.date2002-10-01
dc.date.accessioned2017-04-06T01:03:14Z
dc.date.available2017-04-06T01:03:14Z
dc.identifierJournal of High Energy Physics, v. 6, n. 10, p. 315-329, 2002.
dc.identifier1029-8479
dc.identifierhttp://hdl.handle.net/11449/66982
dc.identifierhttp://acervodigital.unesp.br/handle/11449/66982
dc.identifier10.1088/1126-6708/2002/10/015
dc.identifierWOS:000180552900015
dc.identifier2-s2.0-4744345726
dc.identifierhttp://dx.doi.org/10.1088/1126-6708/2002/10/015
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/888481
dc.descriptionWe 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.
dc.languageeng
dc.relationJournal of High Energy Physics
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCosmology of Theories beyond the SM
dc.subjectPhysics of the Early Universe
dc.titleFine tuning in quintessence models with exponential potentials
dc.typeOtro


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