MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE
Autor(a) principal: | |
---|---|
Data de Publicação: | 2014 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://www.scielo.org.mx/scielo.php?pid=S0185-11012014000200004&script=sci_arttext http://hdl.handle.net/11449/117775 |
Resumo: | In this paper we present an alternative mechanism to generate dark matter particles. We discuss quantitatively the problem of massless particle creation in a flat, homogeneous and isotropic universe expanding with a scale factor which follows directly from a particular f (R) theory of gravity. We find that the main contribution to the total number of particles and total energy comes from small wavenumbers k and particles with large values of k are produced only in the future. If we choose the minimal mode k as corresponding to the maximum wavelength inside the Hubble horizon, we can estimate the present energy density of such massless particles as 10(-120) times the present critical energy density. Such particles form a background field similar to the cosmic microwave background radiation, which could be interpreted as dark matter particles. The study presented here might be the basis for future researches related to the creation of matter in the universe for various models of evolution. |
id |
UNSP_80da79d389626e271b3bebc19cfbb2b3 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/117775 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSEdark matterearly universeIn this paper we present an alternative mechanism to generate dark matter particles. We discuss quantitatively the problem of massless particle creation in a flat, homogeneous and isotropic universe expanding with a scale factor which follows directly from a particular f (R) theory of gravity. We find that the main contribution to the total number of particles and total energy comes from small wavenumbers k and particles with large values of k are produced only in the future. If we choose the minimal mode k as corresponding to the maximum wavelength inside the Hubble horizon, we can estimate the present energy density of such massless particles as 10(-120) times the present critical energy density. Such particles form a background field similar to the cosmic microwave background radiation, which could be interpreted as dark matter particles. The study presented here might be the basis for future researches related to the creation of matter in the universe for various models of evolution.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista, Fac Engn Guaratingueta, UNESP, Dept Quim & Fis, BR-12516410 Guaratingueta, SP, BrazilUniv Fed Sao Joao del Rei, Dept Math & Stat, BR-36307352 Sao Joao Del Rei, MG, BrazilUniv Sao Paulo, Lorena Sch Engn, Dept Basic & Environm Sci, BR-12602810 Lorena, SP, BrazilUniv Estadual Paulista, Fac Engn Guaratingueta, UNESP, Dept Quim & Fis, BR-12516410 Guaratingueta, SP, BrazilCNPq: 477872/2010-7Univ Nacional Autonoma Mexico, Inst De AstronomiaUniversidade Estadual Paulista (Unesp)Univ Fed Sao Joao del ReiUniversidade de São Paulo (USP)Pereira, S. H. [UNESP]Aguilar, J. C. Z.Romao, E. C.2015-03-18T15:56:54Z2015-03-18T15:56:54Z2014-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article195-202application/pdfhttp://www.scielo.org.mx/scielo.php?pid=S0185-11012014000200004&script=sci_arttextRevista Mexicana De Astronomia Y Astrofisica. Mexico City: Univ Nacional Autonoma Mexico, Inst De Astronomia, v. 50, n. 2, p. 195-202, 2014.0185-1101http://hdl.handle.net/11449/117775WOS:000342655500004WOS000342655500004.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengRevista Mexicana De Astronomia Y Astrofisica1.2860,596info:eu-repo/semantics/openAccess2023-10-08T06:06:43Zoai:repositorio.unesp.br:11449/117775Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-08T06:06:43Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
title |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
spellingShingle |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE Pereira, S. H. [UNESP] dark matter early universe |
title_short |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
title_full |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
title_fullStr |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
title_full_unstemmed |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
title_sort |
MASSLESS PARTICLE CREATION IN A F(R) ACCELERATING UNIVERSE |
author |
Pereira, S. H. [UNESP] |
author_facet |
Pereira, S. H. [UNESP] Aguilar, J. C. Z. Romao, E. C. |
author_role |
author |
author2 |
Aguilar, J. C. Z. Romao, E. C. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Univ Fed Sao Joao del Rei Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Pereira, S. H. [UNESP] Aguilar, J. C. Z. Romao, E. C. |
dc.subject.por.fl_str_mv |
dark matter early universe |
topic |
dark matter early universe |
description |
In this paper we present an alternative mechanism to generate dark matter particles. We discuss quantitatively the problem of massless particle creation in a flat, homogeneous and isotropic universe expanding with a scale factor which follows directly from a particular f (R) theory of gravity. We find that the main contribution to the total number of particles and total energy comes from small wavenumbers k and particles with large values of k are produced only in the future. If we choose the minimal mode k as corresponding to the maximum wavelength inside the Hubble horizon, we can estimate the present energy density of such massless particles as 10(-120) times the present critical energy density. Such particles form a background field similar to the cosmic microwave background radiation, which could be interpreted as dark matter particles. The study presented here might be the basis for future researches related to the creation of matter in the universe for various models of evolution. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-10-01 2015-03-18T15:56:54Z 2015-03-18T15:56:54Z |
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://www.scielo.org.mx/scielo.php?pid=S0185-11012014000200004&script=sci_arttext Revista Mexicana De Astronomia Y Astrofisica. Mexico City: Univ Nacional Autonoma Mexico, Inst De Astronomia, v. 50, n. 2, p. 195-202, 2014. 0185-1101 http://hdl.handle.net/11449/117775 WOS:000342655500004 WOS000342655500004.pdf |
url |
http://www.scielo.org.mx/scielo.php?pid=S0185-11012014000200004&script=sci_arttext http://hdl.handle.net/11449/117775 |
identifier_str_mv |
Revista Mexicana De Astronomia Y Astrofisica. Mexico City: Univ Nacional Autonoma Mexico, Inst De Astronomia, v. 50, n. 2, p. 195-202, 2014. 0185-1101 WOS:000342655500004 WOS000342655500004.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Revista Mexicana De Astronomia Y Astrofisica 1.286 0,596 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
195-202 application/pdf |
dc.publisher.none.fl_str_mv |
Univ Nacional Autonoma Mexico, Inst De Astronomia |
publisher.none.fl_str_mv |
Univ Nacional Autonoma Mexico, Inst De Astronomia |
dc.source.none.fl_str_mv |
Web of Science 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_ |
1799964483955720192 |