Age constraints and fine tuning in variable-mass particle models

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dc.contributor.authorFrança, Urbano [UNESP]
dc.contributor.authorRosenfeld, Rogerio [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T20:01:16Z
dc.date.available2022-04-28T20:01:16Z
dc.date.issued2004-01-01
dc.description.abstractVAMP (variable-mass particle) scenarios, in which the mass of the cold dark matter particles is a function of the scalar field responsible for the present acceleration of the Universe, have been proposed as a solution to the cosmic coincidence problem, since in the attractor regime both dark energy and dark matter scale in the same way. We find that only a narrow region in parameter space leads to models with viable values for the Hubble constant and dark energy density today. In the allowed region, the dark energy density starts to dominate around the present epoch and consequently such models cannot solve the coincidence problem. We show that the age of the Universe in this scenario is considerably higher than the age for noncoupled dark energy models, and conclude that more precise independent measurements of the age of the Universe would be useful in distinguishing between coupled and noncoupled dark energy models. © 2004 The American Physical Society.en
dc.description.affiliationInstituto de Física Teórica–UNESP, Rua Pamplona 145, São Paulo, 01405-900
dc.description.affiliationUnespInstituto de Física Teórica–UNESP, Rua Pamplona 145, São Paulo, 01405-900
dc.format.extent6
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.69.063517
dc.identifier.citationPhysical Review D - Particles, Fields, Gravitation and Cosmology, v. 69, n. 6, p. 6-, 2004.
dc.identifier.doi10.1103/PhysRevD.69.063517
dc.identifier.issn1550-2368
dc.identifier.issn1550-7998
dc.identifier.scopus2-s2.0-2342442875
dc.identifier.urihttp://hdl.handle.net/11449/224584
dc.language.isoeng
dc.relation.ispartofPhysical Review D - Particles, Fields, Gravitation and Cosmology
dc.sourceScopus
dc.titleAge constraints and fine tuning in variable-mass particle modelsen
dc.typeArtigo
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