Strong Lensing and Nonminimally Coupled Electromagnetism

Abstract

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 $\delta \theta$ 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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Cited by in corpus (8)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Analytical study of higher-order ring images of accretion disk around black hole
• Shape of higher-order images of equatorial emission rings around a Schwarzschild black hole: Analytical description with polar curves
• Non-minimally coupled electromagnetic fields and observable implications for primordial black holes
• Vacuum polarization effects in the background of a deformed compact object and implications for photon velocity
• Geodesic dynamics and multi-inclination images of a non-minimally coupled black hole with a thin accretion disk
• Angular Location of the $n^{th}$ Einstein Ring at large $n$
• Relativistic Einstein Rings of Reissner-Nordström metric Black Holes Nonminimally Coupled to Electrodynamics