Cosmic transparency and acceleration
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevD.97.023538 http://hdl.handle.net/11449/163771 |
Resumo: | In this paper, by considering an absorption probability independent of photon wavelength, we show that current type Ia supernovae (SNe Ia) and gamma-ray burst (GRB) observations plus high-redshift measurements of the cosmic microwave background (CMB) radiation temperature support cosmic acceleration regardless of the transparent-universe assumption. Two flat scenarios are considered in our analyses: the Lambda CDM model and a kinematic model. We consider tau(z) = 2 ln(1 + z)(epsilon), where tau(z) the opacity between an observer at z = 0 and a source at z. This choice is equivalent to deforming the cosmic distance duality relation as DLDA-1 = (1 + z)(2+epsilon) and, if the absorption probability is independent of photon wavelength, the CMB temperature evolution law is T-CMB (z) = T-0(1 + z)(1+2 epsilon/3). By marginalizing on the epsilon parameter, our analyses rule out a decelerating universe at 99.99% C.L. for all scenarios considered. Interestingly, by considering only SNe Ia and GRBs observations, we obtain that a decelerated universe-indicated by O-Lambda <= 0.33 and q(0) > 0-is ruled out around 1.5 sigma C.L. and 2 sigma C.L., respectively, regardless of the transparent-universe assumption. |
id |
UNSP_f34f0fd79cee337b3f45575a45d8e632 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/163771 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Cosmic transparency and accelerationIn this paper, by considering an absorption probability independent of photon wavelength, we show that current type Ia supernovae (SNe Ia) and gamma-ray burst (GRB) observations plus high-redshift measurements of the cosmic microwave background (CMB) radiation temperature support cosmic acceleration regardless of the transparent-universe assumption. Two flat scenarios are considered in our analyses: the Lambda CDM model and a kinematic model. We consider tau(z) = 2 ln(1 + z)(epsilon), where tau(z) the opacity between an observer at z = 0 and a source at z. This choice is equivalent to deforming the cosmic distance duality relation as DLDA-1 = (1 + z)(2+epsilon) and, if the absorption probability is independent of photon wavelength, the CMB temperature evolution law is T-CMB (z) = T-0(1 + z)(1+2 epsilon/3). By marginalizing on the epsilon parameter, our analyses rule out a decelerating universe at 99.99% C.L. for all scenarios considered. Interestingly, by considering only SNe Ia and GRBs observations, we obtain that a decelerated universe-indicated by O-Lambda <= 0.33 and q(0) > 0-is ruled out around 1.5 sigma C.L. and 2 sigma C.L., respectively, regardless of the transparent-universe assumption.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)IUCAA (Pune)Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, SE, BrazilUniv Fed Campina Grande, Dept Fis, BR-58429900 Campina Grande, PB, BrazilUniv Estadual Paulista, UNESP, Fac Engn, Guaratingueta Dept Fis & Quim, BR-12516410 Guaratingueta, SP, BrazilUniv Delhi, Deen Dayal Upadhyaya Coll, Sect 3, New Delhi 110078, IndiaUniv Fed Rio Grande do Norte, Dept Fis, BR-59078970 Natal, RN, BrazilUniv Estadual Paulista, UNESP, Fac Engn, Guaratingueta Dept Fis & Quim, BR-12516410 Guaratingueta, SP, BrazilCNPq: 303734/2014-0CNPq: 304297/2015-1CNPq: 400924/2016-1Amer Physical SocUniversidade Federal de Sergipe (UFS)Univ Fed Campina GrandeUniversidade Estadual Paulista (Unesp)Univ DelhiUniv Fed Rio Grande do NorteHolanda, R. F. L.Pereira, S. H. [UNESP]Jain, Deepak2018-11-26T17:44:55Z2018-11-26T17:44:55Z2018-01-29info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article9application/pdfhttp://dx.doi.org/10.1103/PhysRevD.97.023538Physical Review D. College Pk: Amer Physical Soc, v. 97, n. 2, 9 p., 2018.2470-0010http://hdl.handle.net/11449/16377110.1103/PhysRevD.97.023538WOS:000423434600009WOS000423434600009.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review D1,801info:eu-repo/semantics/openAccess2024-01-23T07:10:57Zoai:repositorio.unesp.br:11449/163771Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-23T07:10:57Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Cosmic transparency and acceleration |
title |
Cosmic transparency and acceleration |
spellingShingle |
Cosmic transparency and acceleration Holanda, R. F. L. |
title_short |
Cosmic transparency and acceleration |
title_full |
Cosmic transparency and acceleration |
title_fullStr |
Cosmic transparency and acceleration |
title_full_unstemmed |
Cosmic transparency and acceleration |
title_sort |
Cosmic transparency and acceleration |
author |
Holanda, R. F. L. |
author_facet |
Holanda, R. F. L. Pereira, S. H. [UNESP] Jain, Deepak |
author_role |
author |
author2 |
Pereira, S. H. [UNESP] Jain, Deepak |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Sergipe (UFS) Univ Fed Campina Grande Universidade Estadual Paulista (Unesp) Univ Delhi Univ Fed Rio Grande do Norte |
dc.contributor.author.fl_str_mv |
Holanda, R. F. L. Pereira, S. H. [UNESP] Jain, Deepak |
description |
In this paper, by considering an absorption probability independent of photon wavelength, we show that current type Ia supernovae (SNe Ia) and gamma-ray burst (GRB) observations plus high-redshift measurements of the cosmic microwave background (CMB) radiation temperature support cosmic acceleration regardless of the transparent-universe assumption. Two flat scenarios are considered in our analyses: the Lambda CDM model and a kinematic model. We consider tau(z) = 2 ln(1 + z)(epsilon), where tau(z) the opacity between an observer at z = 0 and a source at z. This choice is equivalent to deforming the cosmic distance duality relation as DLDA-1 = (1 + z)(2+epsilon) and, if the absorption probability is independent of photon wavelength, the CMB temperature evolution law is T-CMB (z) = T-0(1 + z)(1+2 epsilon/3). By marginalizing on the epsilon parameter, our analyses rule out a decelerating universe at 99.99% C.L. for all scenarios considered. Interestingly, by considering only SNe Ia and GRBs observations, we obtain that a decelerated universe-indicated by O-Lambda <= 0.33 and q(0) > 0-is ruled out around 1.5 sigma C.L. and 2 sigma C.L., respectively, regardless of the transparent-universe assumption. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-11-26T17:44:55Z 2018-11-26T17:44:55Z 2018-01-29 |
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/10.1103/PhysRevD.97.023538 Physical Review D. College Pk: Amer Physical Soc, v. 97, n. 2, 9 p., 2018. 2470-0010 http://hdl.handle.net/11449/163771 10.1103/PhysRevD.97.023538 WOS:000423434600009 WOS000423434600009.pdf |
url |
http://dx.doi.org/10.1103/PhysRevD.97.023538 http://hdl.handle.net/11449/163771 |
identifier_str_mv |
Physical Review D. College Pk: Amer Physical Soc, v. 97, n. 2, 9 p., 2018. 2470-0010 10.1103/PhysRevD.97.023538 WOS:000423434600009 WOS000423434600009.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review D 1,801 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
9 application/pdf |
dc.publisher.none.fl_str_mv |
Amer Physical Soc |
publisher.none.fl_str_mv |
Amer Physical Soc |
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_ |
1799965707017912320 |