Potenciais pseudo-newtonianos e a radiação escalar emitida por uma fonte girando ao redor de um objeto estelar
We 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 qu...
| Autor principal: | CRUZ FILHO, Jaime Luis Cardoso da |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5084 |
| Resumo: |
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We 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. |