2014-06-172014-06-172010CRUZ FILHO, Jaime Luis Cardoso da. Potenciais pseudo-newtonianos e a radiação escalar emitida por uma fonte girando ao redor de um objeto estelar. 2010. 66 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Belém, 2010. Programa de Pós-Graduação em Física.https://repositorio.ufpa.br/handle/2011/5084We use the pseudo-newtonian potentials proposed by Paczynski and Wiita, Nowak and Wagoner and Artemova et al. to calculate the scalar radiation emitted by a source in uniform circular motion around a stellar object. We compare the results obtained in this approach with the results obtained via quantum eld theory in Schwarzschild spacetime. We find that, up to the marginally stable circular orbit (R = 6M) the potential that better reproduces the Schwarzschild result is the Nowak and Wagoner one. Between this orbit and the last unstable circular orbit (R = 3M) neither one of the pseudo-newtonian potentials produce satisfactory results, and the newtonian potential turns out to be the best approximation. The Paczy nski and Wiita potential, the most used in the literature to analyze accretion disks, generates the less satisfactory results for this situation.porAcesso AbertoRadiação escalarTeoria quântica de camposDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DAS PARTICULAS ELEMENTARES E CAMPOS