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Title: An analysis of helium primordial nucleosynthesis with a variable cosmological coupling
metadata.dcterms.creator: Alvarenga, Flávio Gimenes
Fabris, Júlio César
Gonçalves, Sergio Vitorino de Borba
Marinho, Josenilson Ádnei Oliveira
metadata.dcterms.subject: Helium;Nucleosynthesis Hélio
metadata.dcterms.issued: Dec-2001
metadata.dcterms.abstract: 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.
ISSN: 0103-9733
Appears in Collections:DFIS - Artigos publicados em periódicos

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