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• W2976133089 abstract "The electromagnetic signature of a point explosion near a Kerr black hole (BH) is evaluated. The first repetitions produced by gravitational lensing are not periodic in time; periodicity emerges only as the result of multiple circuits of the prograde and retrograde light rings and is accompanied by exponential dimming. Gravitational focusing creates a sequence of concentrated caustic features and biases the detection of a repeating source toward alignment of the BH spin with the plane of the sky. We consider the polarization pattern in the case of emission by the Lorentz upboosting and reflection of a magnetic field near the explosion site. Then the polarized fraction of the detected pulse approaches unity, and rays propagating near the equatorial plane maintain a consistent polarization direction. Near a slowly accreting supermassive BH (SMBH), additional repetitions are caused by reflection off annular fragments of an orbiting disk that has passed through an ionization instability. These results are applied to the repeating fast radio burst (FRB) source 121102, giving a concrete and predictive example of how FRB detectability may be biased by lensing. A gravitational lensing delay of 10-30 s, and reflection delay up to $sim 10^4$ s, are found for emission near the innermost stable circular orbit of a $3times 10^5,M_odot$ SMBH; these effects combine to produce interesting correlations between delay time and burst fluence. A similar repetitive pulse envelope could be seen in the gravitational wave signal produced by a collision between compact stars near a SMBH." @default.
• W2976133089 created "2019-10-03" @default.
• W2976133089 creator A5006526357 @default.
• W2976133089 date "2019-03-21" @default.
• W2976133089 modified "2023-10-14" @default.
• W2976133089 title "Impulsive Electromagnetic Emission near a Black Hole" @default.
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• W2976133089 doi "https://doi.org/10.3847/1538-4357/aafda3" @default.
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