A natural cosmological constant from chameleons

Detalhes bibliográficos
Autor(a) principal: Nastase, Horatiu [UNESP]
Data de Publicação: 2015
Outros Autores: Weltman, Amanda
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.physletb.2015.05.066
http://hdl.handle.net/11449/171873
Resumo: We 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).
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spelling A natural cosmological constant from chameleonsWe 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).Instituto de Física Teórica, UNESP-Universidade Estadual Paulista, R. Dr. Bento T. Ferraz 271, Bl. IIAstrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape Town, Private BagInstituto de Física Teórica, UNESP-Universidade Estadual Paulista, R. Dr. Bento T. Ferraz 271, Bl. IIUniversidade Estadual Paulista (Unesp)Astrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape TownNastase, Horatiu [UNESP]Weltman, Amanda2018-12-11T16:57:32Z2018-12-11T16:57:32Z2015-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article200-204application/pdfhttp://dx.doi.org/10.1016/j.physletb.2015.05.066Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 747, p. 200-204.0370-2693http://hdl.handle.net/11449/17187310.1016/j.physletb.2015.05.0662-s2.0-84930666303Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics2,336info:eu-repo/semantics/openAccess2024-01-27T06:56:41Zoai:repositorio.unesp.br:11449/171873Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-06T00:05:45.978835Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv A natural cosmological constant from chameleons
title A natural cosmological constant from chameleons
spellingShingle A natural cosmological constant from chameleons
Nastase, Horatiu [UNESP]
title_short A natural cosmological constant from chameleons
title_full A natural cosmological constant from chameleons
title_fullStr A natural cosmological constant from chameleons
title_full_unstemmed A natural cosmological constant from chameleons
title_sort A natural cosmological constant from chameleons
author Nastase, Horatiu [UNESP]
author_facet Nastase, Horatiu [UNESP]
Weltman, Amanda
author_role author
author2 Weltman, Amanda
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Astrophysics, Cosmology and Gravity Center, Department of Mathematics and Applied Mathematics, University of Cape Town
dc.contributor.author.fl_str_mv Nastase, Horatiu [UNESP]
Weltman, Amanda
description We 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).
publishDate 2015
dc.date.none.fl_str_mv 2015-07-01
2018-12-11T16:57:32Z
2018-12-11T16:57:32Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.physletb.2015.05.066
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 747, p. 200-204.
0370-2693
http://hdl.handle.net/11449/171873
10.1016/j.physletb.2015.05.066
2-s2.0-84930666303
url http://dx.doi.org/10.1016/j.physletb.2015.05.066
http://hdl.handle.net/11449/171873
identifier_str_mv Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 747, p. 200-204.
0370-2693
10.1016/j.physletb.2015.05.066
2-s2.0-84930666303
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
2,336
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 200-204
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808129581877559296

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