Cosmologia Quântica com Vácuo Dinâmico em um Cenário de Comprimento Mínimo.

• Ano de defesa: 2021
• Autor(a) principal: Gusson, Michael França
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Doutorado em Física; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Cosmologia quântica; gravitação quântica; vácuo dinâmico; comprimento mínimo; Princípio da Incerteza Generalizado (GUP); subject.br-rjbn; Física
• Link de acesso: http://repositorio.ufes.br/handle/10/14736

Theories that propose the unification of general relativity and quantum mechanics, for example the String Theory, point to the existence of a minimum value of observable length. The existence of this implies a generalization of the Heisenberg’s uncertainty principle, so as to no more admit a null uncertainty in position, thus modifying the algebra of quantum mechanics. According to the cosmological model of the Big Bang, the Universe is expanding, which it means that it was very small in the past, so its nature was fundamentally quantum. Thus, it is necessary to build a quantum description of the evolution of the Universe, under the context of modified algebra due to the existence of a minimum length. In this work, was considered the effects in a dynamic vacuum cosmological model, due to the presence of a minimum length introduced by a GUP (generalized uncertainty principle) related to the modified commutation relation [x, p] = ih/1−βP2 . The wave function of the Universe, which is the solution of the Wheeler-DeWitti equation in the representation of the quasiposition space, was found at the limit for small values of the scale factor.