Ondas gravitacionais e o espectro de anisotropia tensorial na presença de neutrinos cosmológicos
AUTOR(ES)
Jonas Floriano Gomes dos Santos
FONTE
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
10/07/2012
RESUMO
In this work we have studied the evolution of primordial gravitational waves coupled to anisotropic stress tensor of cosmological neutrinos. As in a radiation dominated universe, in a universe dominated by radiation and matter the neutrinos can work as an effective dispersive medium for the gravitational waves, besides introduce small modifications over the tensor contribution to the cosmological microwave background anisotropy. Our results are obtained in a radiation-matter transition scenario (RMD), so that we contemplate modes that cross the horizon in the radiation era and matter era. Using the evolution variable kη, it was possible to write our solutions independent from the frequency of the wave. Our results ratify that CT l die out after l ∼ 100 with small modifications on the quadrupole term, CT 2 , due to the coupling to neutrinos and the inclusion of collision terms into the dynamical equations.
ASSUNTO(S)
fisica física cosmologia ondas gravitacionais neutrinos
ACESSO AO ARTIGO
http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=5525Documentos Relacionados
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