Geração de termos com violação de simetria de Lorentz à temperatura finita

• Autor(a) principal: Freire, Wellington Romero Serafim
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/1561
• topic: Termo de Chern-Simons; Termo tipo éter; Temperatura finita; Simetria de Lorentz; Física - partículas; Ether type term; Finite temperature; Symmetry of Lorentz; Physics - particles; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA

In this thesis, we investigated the generation of the higher derivative Chern-Simons term, as well as the ether-like term, both at finite temperature. We also examined the question of the large gauge invariance, with respect to the Chern-Simons term and the hight derivative one. We observed that the coefficient of the Chern-Simons term vanishes, when we taken into account the limit of high temperature. This happens to occur also for the other high derivative terms. With respects to the Chern-Simons term, we observed that the action of the Chern-Simons term and the high derivative one are invariant under the large gauge transformation. For this, we calculated the exactly effective action, however, for a specific gauge choice. Finally, with respects to the ether-like term, we observed that the calculation at finite temperature is ambiguous, as well as it is observed for the calculation at zero temperature.