Teorias de K-essência em espaços-tempos estáticos e esfericamente simétricos

• Ano de defesa: 2016
• Autor(a) principal: Rodrigues, Denis Campos
• 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: General Relativity; Scalar-tensor theories; Relatividade Geral; Teorias Escalares-Tensoriais; Cosmologia; Física
• Link de acesso: http://repositorio.ufes.br/handle/10/7469

The study of general relativity minimally coupled to a scalar field in a static and spherically symmetric space-time shows that black hole solutions are possible with the existence of a scalar phantom field. These black holes, considered exotic, have infinite area horizon and zero Hawking temperature, hence they are called ”cold black holes”. Our objective is to propose a study of statics and spherically symmetric space-times in theories of k-essence. Such theories are widely applied in the context of accelerated expansion of the universe, dark energy and inflationary models, however there is a gap in the study of local objects such as stars, black holes and wormholes. In our study of k-essence theories in static and spherically symmetric settings resulted in two different solutions: a first solution with features similars to those found in cold black holes, but with two event horizons (of cosmological nature) and non-asymptotically flat; and a second solution with only one event horizon, similar to the Schwarzschild solution immersed in asymptotically singular space-time.