Paredes de domínio curvas em gravitação quase-topológica

• Ano de defesa: 2013
• Autor(a) principal: Jorge, William Celestino Algoner
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Física; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Gravitation; General Relativity; Field theory; Gravitação; Relatividade geral; Teoria de campos; Relatividade geral (Física); Teoria de campos (Física); Física; 53
• Link de acesso: http://repositorio.ufes.br/handle/10/7449

Extensions of General Relativity, with higher order terms in the curvature, have been used in order to better understand phenomena in scales where quantum effects become important. However, such extensions may produce undesirable effects, as the appearing of “ ghosts” and also equations of order greater than two, which complicates the Cauchy problem. In this dissertation we study a class of theories, known as Quasi Topological Gravity (QTG) , where these effects , by construction, are circumvented. In particular, we construct exact domain wall type solutions for QTG coupled to a scalar field subject to som potential for the case in which the vacua of the theory are Anti de Sitter (AdS) spaces. Our analysis is performed for an arbitrary dimension d of the space-time making use of an ansatz which considers the slicing of this space in (d-1) hypersurfaces with negative or positive curvature.