Radiação emitida por uma carga elétrica orbitando um buraco negro de Schwarzschild segundo Teoria Quântica de Campos

• Autor(a) principal: FIGUEIRA, Rodrigo Murta de Andrade
• Data de Publicação: 2004
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFPA
• Texto Completo: http://www.repositorio.ufpa.br:8080/jspui/handle/2011/1783
• topic: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL::RELATIVIDADE E GRAVITACAO; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DAS PARTICULAS ELEMENTARES E CAMPOS; Radiação eletromagnética; Teoria quântica de campos; Buraco negro

We performthe quantization of the massless vector field in Minkowski and Schwarz-schild spacetimes, and calculate the radiated power by an electric charge in a circular orbit around an object with mass M in both spacetimes. In the Minkowski case wend the analytical expression for the radiated power using quantum field theory and assuming Newtonian gravity. It coincides with classical Larmors result, since the calculations are performed at the tree level. Since in the Schwarzschild case it is not possible to express the solution of the radial equation in terms of well known special functions, we adopt the following two approaches: analytical approximation in the low frequency limit and numerical computing. The first approach was used as a consistency check for the numerical one. We also use quantum eld theory at tree level in the Schwarzschid case, and the radiated power is obtained both in the low frequency limit as well as numerically. After comparing the results, we conclude that for the same angular velocity of the charge (as measured by asymptotical static observers), the radiated power in Minkowski spacetime is bigger than in Schwarzschild case.