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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.dimensionspub.1022527377
dc.identifier.doi10.1016/j.physletb.2015.05.066
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.orcid0000-0002-5974-4114
dc.identifier.orcid0000-0002-9383-6047
dc.identifier.scopus2-s2.0-84930666303
dc.identifier.urihttp://hdl.handle.net/11449/171873
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
dc.relation.ispartofsjr2,336
dc.rights.accessRightsAcesso abertopt
dc.sourceScopus
dc.sourceDimensions
dc.titleA natural cosmological constant from chameleonsen
dc.typeArtigopt
dspace.entity.typePublication
relation.isOrgUnitOfPublication41d94a5b-139b-457c-90a7-77b71f4e94df
relation.isOrgUnitOfPublication.latestForDiscovery41d94a5b-139b-457c-90a7-77b71f4e94df
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Física Teórica (IFT), São Paulopt

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