Kavli Affiliate: Ke Wang
| First 5 Authors: Ke Wang, Ke Wang, , ,
| Summary:
In the Kerr-Sen black hole, this study investigates the changes in hotspot
images before and after the occurrence of magnetic reconnection. After
reviewing the Comisso-Asenjo magnetic reconnection process and introducing the
hotspot imaging method, we examine the temporal evolution of hotspot intensity,
including when energy extraction occurs, when it does not occur, and when the
observer’s azimuthal angle is altered. We also discuss the influence of the
black hole’s expansion parameter and spin on hotspot imaging. The results
indicate that the first flare may serve as a potential signature of ongoing
energy extraction: changing the observer’s azimuthal angle may alter the time
interval between the first and second flares: a larger expansion parameter
makes it more difficult to identify the energy extraction signal, and a higher
spin also makes it more challenging to detect the energy extraction signal.
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