Efficient gravitational lens optical scalars calculation of black holes with angular momentum
We provide new very simple and compact expressions for the efficient calculation of gravitational lens optical scalars for Kerr space-time, which are exact along any null geodesic. These new results are obtained recurring to well-known results on geodesic motion that exploit obvious and hidden symme...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/141096 |
| Acceso en línea: | http://hdl.handle.net/11336/141096 |
| Access Level: | acceso abierto |
| Palabra clave: | BLACK HOLE PHYSICS GRAVITATION GRAVITATIONAL LENSING STRONG https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | We provide new very simple and compact expressions for the efficient calculation of gravitational lens optical scalars for Kerr space-time, which are exact along any null geodesic. These new results are obtained recurring to well-known results on geodesic motion that exploit obvious and hidden symmetries of Kerr space-time and contrast with the rather long and cumbersome expressions previously reported in the literature, providing a helpful improvement for the sake of an efficient integration of the geodesic deviation equation on Kerr geometry. We also introduce a prescription for the observer frame that captures a new notion of centre of the black hole, which can be used for any position of the observer, including those near the black hole. We compare the efficient calculation of weak lens optical scalars with the exact equations, finding an excellent agreement. |
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