Algumas peculiaridades da radiação associada a uma eletrodinâmica que viola a simetria de Lorentz

• Autor(a) principal: Fonseca, Jakson Miranda
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4237
• topic: Simetria de Lorentz; Quebra de simetria; Eletrodinâmica; Teoria de campos; Espectro de corpo negro; Correções radiativas; Lorentz symmetry; Symmetry violation; Eletrodynamic; Eld theory; Blackbody spectrum; Radiative corrections; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DAS PARTICULAS ELEMENTARES E CAMPOS::TEORIA GERAL DE PARTICULAS E CAMPOS

We discuss an effective eld theory in (3+1) dimensions incorporating Lorentz violations. The model considered is the Standard Model Extension (SME), the most general observer independent eld theoretical framework for investigations of Lorentz violation symmetry. A brief review on this framework is given with particular emphasis on the gauge sector of the \quantum electrodynamics" coming about from the SME, where a number of issues related to the emission and absorption of radiation by non-relativistic electrons in (3+1) dimensions taken into account. Among other results, we have realized that Planck-type law acquires extra terms proportional to the violating parameters: for the CPT -odd model, the leading extra terms appear to be linear or quadratic in these violating parameters according to the background vector is parallel or perpendicular to the photon wave-vector. Also, the radiation spectrum presents an anisotropic angular distribution. In the CPT -even case a linear "correction" shows up. Among other possible ways to probe for these violations, by means of the present results, we may quote the direct observation of the extra contributions for the radiation spectrum or a di erence in the photon mean occupation number for the two distinct modes. Although very small, such e ects may be enhanced at very low temperatures and frequencies. We argue, based on the algebraic method of renormalization, that radiative corrections arising from the coupling of fermions to a constant vector bµ do not induce a Lorentz and CPT violating Chern-Simons-like term in the QED action.