Fine tuning in quintessence models with exponential potentials
dc.contributor.author | França, Urbano [UNESP] | |
dc.contributor.author | Rosenfeld, Rogério [UNESP] | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-05-27T11:20:30Z | |
dc.date.available | 2014-05-27T11:20:30Z | |
dc.date.issued | 2002-10-01 | |
dc.description.abstract | We 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.affiliation | Instituto de Física Teórica UNESP, Rua Pamplona, 145, 01405-900 São Paulo, SP | |
dc.description.affiliationUnesp | Instituto de Física Teórica UNESP, Rua Pamplona, 145, 01405-900 São Paulo, SP | |
dc.format.extent | 315-329 | |
dc.identifier | http://dx.doi.org/10.1088/1126-6708/2002/10/015 | |
dc.identifier.citation | Journal of High Energy Physics, v. 6, n. 10, p. 315-329, 2002. | |
dc.identifier.doi | 10.1088/1126-6708/2002/10/015 | |
dc.identifier.issn | 1029-8479 | |
dc.identifier.scopus | 2-s2.0-4744345726 | |
dc.identifier.uri | http://hdl.handle.net/11449/66982 | |
dc.identifier.wos | WOS:000180552900015 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of High Energy Physics | |
dc.relation.ispartofjcr | 5.541 | |
dc.relation.ispartofsjr | 1,227 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Scopus | |
dc.subject | Cosmology of Theories beyond the SM | |
dc.subject | Physics of the Early Universe | |
dc.title | Fine tuning in quintessence models with exponential potentials | en |
dc.type | Artigo | |
dcterms.license | http://iopscience.iop.org/page/copyright | |
unesp.campus | Universidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulo | pt |