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A natural cosmological constant from chameleons

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dc.contributor.authorNastase, Horatiu [UNESP]
dc.contributor.authorWeltman, Amanda
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAstrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape Town
dc.date.accessioned2018-12-11T16:57:32Z
dc.date.available2018-12-11T16:57:32Z
dc.date.issued2015-07-01
dc.description.abstractWe present a simple model where the effective cosmological constant appears from chameleon scalar fields. For a Kachru-Kallosh-Linde-Trivedi (KKLT)-inspired form of the potential and a particular chameleon coupling to the local density, patches of approximately constant scalar field potential cluster around regions of matter with density above a certain value, generating the effect of a cosmological constant on large scales. This construction addresses both the cosmological constant problem (why Λ is so small, yet nonzero) and the coincidence problem (why Λ is comparable to the matter density now).en
dc.description.affiliationInstituto de Física Teórica, UNESP-Universidade Estadual Paulista, R. Dr. Bento T. Ferraz 271, Bl. II
dc.description.affiliationAstrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape Town, Private Bag
dc.description.affiliationUnespInstituto de Física Teórica, UNESP-Universidade Estadual Paulista, R. Dr. Bento T. Ferraz 271, Bl. II
dc.format.extent200-204
dc.identifierhttp://dx.doi.org/10.1016/j.physletb.2015.05.066
dc.identifier.citationPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 747, p. 200-204.
dc.identifier.doi10.1016/j.physletb.2015.05.066
dc.identifier.issn0370-2693
dc.identifier.scopus2-s2.0-84930666303
dc.identifier.urihttp://hdl.handle.net/11449/171873
dc.language.isoeng
dc.relation.ispartofPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.relation.ispartofsjr2,336
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.titleA natural cosmological constant from chameleonsen
dc.typeArtigo
dspace.entity.typePublication
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Física Teórica (IFT), São Paulopt

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São Paulo - IFT - Instituto de Física Teórica