Observáveis de Matéria Escura como um Férmion de Majorana

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Santos, Maíra Dutra Vasconcelos dos
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal da Paraí­ba
BR
Física
Programa de Pós-Graduação em Física
UFPB
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/5758
Resumo: Dark Matter (DM) is a key piece for our understanding of the universe evolution. Its existence has been confirmed by gravitational effects on the known matter, and we do not know its constitution just yet. The assumption that DM is composed of particles demands an extension of the Standard Model of Elementary Particles (SM). There are many experiments searching for neutral, stable, weakly interacting particles so called WIMPs, but no conclusive positive signal has been observed so far. That being said, we propose a Majorana fermion to be our DM candidate in one of the simplest minimal extensions of the SM, which adds to the scalar sector a neutral scalar that mixes to the Higgs boson. Further, we study another model which supplements the former by adding a charged scalar, which mediates interactions between the DM particle and leptons. In both models, we compute the relic density, the scattering cross section off nucleon (Direct Detection), and its annihilation rate in Standard Model particles (Indirect Detection) using the numerical package micrOMEGAs. In conclusion, we interestingly find that such models have regions of the parameter space yielding the right abundance while compatible with direct and indirect detection limits. Lastly, we investigate the possibility having the Majoron risen in our extensions as dark radiation in the light of the recent CMB spectrum analyses.