Localização de campos em branas isotrópicas e anisotrópicas em seis dimensões

• Ano de defesa: 2013
• Autor(a) principal: Sousa, Luís José Silveira de
• Orientador(a): Almeida, Carlos Alberto Santos de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Mundo brana; Ondas estacionárias; Anisotropia
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/13882

This work describes isotropic and anisotropic braneworlds emphasizing the localization of fields in this scenarios. In spite of studding its cosmology, the approach consider the viability of field localization in such models. It is relevant to say that the anisotropic model presented here was first implemented in five dimensions. This solution was obtained in the presence of a phantom like scalar field, but this kind of matter do not satisfies the classical energy conditions. By this reason in the work proposed here it has been tried to obtain a standing wave braneworld solution in the presence of normal matter. In the context of isotropic braneworld it was found important solutions. Particularly, it was obtained a 4-brane as solution of a six dimensional Einstein gravitational theory with the feature that the compact dimension belongs to the brane (hybrid compactification). This solution, which represents a thick brane, generalizes some braneworld models in six dimensions, as the string-like defect. The localization of the scalar, vector and fermion fields was successfully performed. An other relevant result obtained in six dimensional isotropic braneworld was the study of localization of the tensor or Kalb-Ramond field in the string-like defect. In the context of anisotropic standing wave braneworld it was possible to generalizes the original five dimensional model to six dimensions. Particularly, the thick braneworld cited above was generalized for the case of an anisotropic thick brane. A simplified solution in the form of a thin brane was found and the study of localization for the scalar and fermions fields was implemented. This solution was obtained with a phantom like scalar as source similar to the solution found in five dimensions. Finally it has been found a solutions in the presence of not normal and normal matter. This last version satisfies the energy conditions and presents the possibility to solve the hierarchy problem in the same way that one solve it in Randall-Sundrum-like models.