An analysis of helium primordial nucleosynthesis with a variable cosmological coupling
Autor(a) principal: | |
---|---|
Data de Publicação: | 2001 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Physics |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332001000400004 |
Resumo: | The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of G in the primordial nucleosynthesis. To be specific, we construct a cosmological model with varying G, using the Brans-Dicke theory. The greater the value of G at nucleosynthesis period, the greater the predicted abundance of helium. Using the observational data for the abundance of primordial helium, constraints for the time variation of G are established. |
id |
SBF-2_242e29687e1e08a332ba8620a4d1bf7f |
---|---|
oai_identifier_str |
oai:scielo:S0103-97332001000400004 |
network_acronym_str |
SBF-2 |
network_name_str |
Brazilian Journal of Physics |
repository_id_str |
|
spelling |
An analysis of helium primordial nucleosynthesis with a variable cosmological couplingThe synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of G in the primordial nucleosynthesis. To be specific, we construct a cosmological model with varying G, using the Brans-Dicke theory. The greater the value of G at nucleosynthesis period, the greater the predicted abundance of helium. Using the observational data for the abundance of primordial helium, constraints for the time variation of G are established.Sociedade Brasileira de Física2001-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332001000400004Brazilian Journal of Physics v.31 n.4 2001reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332001000400004info:eu-repo/semantics/openAccessAlvarenga,F.G.Fabris,J.C.Gonçalves,S.V.B.Marinho,J.A.O.eng2002-04-23T00:00:00Zoai:scielo:S0103-97332001000400004Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2002-04-23T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false |
dc.title.none.fl_str_mv |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
title |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
spellingShingle |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling Alvarenga,F.G. |
title_short |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
title_full |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
title_fullStr |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
title_full_unstemmed |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
title_sort |
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling |
author |
Alvarenga,F.G. |
author_facet |
Alvarenga,F.G. Fabris,J.C. Gonçalves,S.V.B. Marinho,J.A.O. |
author_role |
author |
author2 |
Fabris,J.C. Gonçalves,S.V.B. Marinho,J.A.O. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Alvarenga,F.G. Fabris,J.C. Gonçalves,S.V.B. Marinho,J.A.O. |
description |
The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance of helium as function of the gravitational coupling, using a semi-analytical method, in order to track the influence of G in the primordial nucleosynthesis. To be specific, we construct a cosmological model with varying G, using the Brans-Dicke theory. The greater the value of G at nucleosynthesis period, the greater the predicted abundance of helium. Using the observational data for the abundance of primordial helium, constraints for the time variation of G are established. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332001000400004 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332001000400004 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-97332001000400004 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
Brazilian Journal of Physics v.31 n.4 2001 reponame:Brazilian Journal of Physics instname:Sociedade Brasileira de Física (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Física (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Brazilian Journal of Physics |
collection |
Brazilian Journal of Physics |
repository.name.fl_str_mv |
Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF) |
repository.mail.fl_str_mv |
sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br |
_version_ |
1754734859466571776 |