Complex scalar dark matter in a B-L model

• Autor(a) principal: Schmitz, Ernany Rossi [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108893
• topic: Matéria escura (Astronomia); Interações fracas (Fisica nuclear); Partículas (Física nuclear)

In the ?rst part of this work, we provide the historical background that underlies the evidence of dark matter. Also, we present here some of the most studied dark matter candidates. Later, we show the necessary tools for the understanding of relic density calculation, such as the basics of General Relativity and the early Universe Cosmology (thermodynamics of the early Universe, the thermal average of the annihilation cross section times the velocity, and both the approximated analytical and numerical solutions to the Boltzmann equation). Finally, in this grounding part, we discuss brie?y some of both direct and indirect detection experiments and constraints imposed by them on dark matter. In the second part, we analyze an extension of the Standard Model (SM) obtained by adding to the gauge symmetry a local U(1) group of charge B-L , baryon minus lepton numbers. Weshowthatthisextension,calledB-LModel,cancontaintwoviablecolddark matter candidates and we study the conditions on the space of parameters of the scalar potential that both yields the observed relic density and is in agreement with constraints which come from direct detection experiments