Potencial efetivo em modelos com violação de Lorentz

• Autor(a) principal: Farias, Claudio Fernando Ferreira
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/tede/5730
• topic: Violação da invariância de Lorentz; Potencial efetivo; Formulação de Horava-Lifshitz; Modelo de Kostelecký-Berger; Lorentz invariance violation; Effective potential; Horava- Lifshitz formulation; Kostelecký-Berger model; CIENCIAS EXATAS E DA TERRA::FISICA

In this thesis, we review some basic concepts related to Lorentz symmetry violation and Horava-Lifshitz-like theories. We present our contribution to the calculation of the effective potential in two frameworks that exhibit Lorentz invariance violation. First, we calculate the effective potential for some HL-like theories. We obtained results for the pure scalar model, for the scalar QED with critical exponent z = 2 and z generic, and for the Yukawa model also with z = 2 and with arbitrary values of z. For the latter model, we show that the effective potential vanishes for even z and has nontrivial values for odd z. The second framework is the Kostelecký-Berger model that implements the Lorentz symmetry breaking in supersymmetry. We develop the theory of superfields for three and four-dimensional space-time based on this model and show how this development leads to a theory of superfields with ether-like Lorentz violation. We also obtained the one loop contributions to the effective action and effective potential in this theory.