Strong lensing and nonminimally coupled electromagnetism

Strong lensing and nonminimally coupled electromagnetism

The lensing at large deflection angles caused by a Schwarzschild black hole for the case of a nonminimal coupling between gravitation and electromagnetism is examined. We show that photons follow an effective geometry, which displays an effective photon sphere. For the case in which the source, lens...

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Veröffentlicht in:Physical review. D 2020-06, Vol.101 (12), p.1, Article 124038
Hauptverfasser: Bergliaffa, Santiago E. P., Filho, Edson Elias de Souza, Maier, Rodrigo
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Angles (geometry)
Coupling
Electromagnetism
Parameters
Photons
Separation
Telescopes
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creator Bergliaffa, Santiago E. P.
Filho, Edson Elias de Souza
Maier, Rodrigo
description The lensing at large deflection angles caused by a Schwarzschild black hole for the case of a nonminimal coupling between gravitation and electromagnetism is examined. We show that photons follow an effective geometry, which displays an effective photon sphere. For the case in which the source, lens and observer are aligned, so that relativistic Einstein rings are formed, the dependence of the angular separation δθ between the first and second ring with the relevant coupling parameter is calculated. We argue that such a separation, which may be measured by telescopes that will be operative in the near future, may set an upper and a lower limit for the coupling parameter.
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subjects Angles (geometry)
Coupling
Electromagnetism
Parameters
Photons
Separation
Telescopes
title Strong lensing and nonminimally coupled electromagnetism
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