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An analysis of helium primordial nucleosynthesis with a variable cosmological coupling
(2001-12)
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 ...
Effects of active-sterile neutrino mixing during primordial nucleosynthesis
(World Scientific, 2014-11)
In the present work, we discuss the effects of the inclusion of sterile-active neutrino oscillations during the production of primordial light-nuclei. We assume that the sterile neutrino mass-eigenstate might oscillate ...
Observational constraints to a unified cosmological model
(Elsevier, 2020)
A nucleossíntese no universo primordial
(Universidade Federal de São Paulo, 2020-10-09)
Neste trabalho, concentramos no estudo da Nucleossíntese Primordial, abordando tanto os
processos nucleares nela envolvidos, como sua importância para a história do Universo como
o conhecemos, e para o desenvolvimento ...
New cosmological constraints on the variation of fundamental constants: the fine structure constant and the Higgs vacuum expectation value
(EDP Sciences, 2013-03)
Aims: We study the time variation of the fine structure constant, α, and the Higgs vacuum expectation value v, during the Big Bang nucleosynthesis (BBN). Methods: We computed primordial abundances of light nuclei produced ...
Primordial Nucleosynthesis with Varying Fundamental Constants: A Semianalytical Approach
(IOP Publishing, 2006-01)
Using the semi-analytic method proposed by Esmaizaldeh and coworkers we calculate the abundances of the light elements produced during primordial nucleosynthesis assuming that the gauge coupling constants of the fundamental ...