Shielding a charged black hole

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We describe a shielding mechanism for a charged black hole immersed in a background involving charged matter fields, solely arising from the Einstein-Maxwell field equations. In particular, we consider a charged generalization of the Einstein cluster, that is a charged black hole surrounded by an effective fluid model for a partially charged dust cloud. We show that the shielding mechanism, arising thereof, is generic and appears in a different parametrization of the problem as well. In this process, we provide the most general electrovacuum solution in a spacetime region devoid of charges, but in the presence of a static and spherically symmetric charge distribution elsewhere. Side by side, we also introduce a convenient parametrization, providing the global solution of the Einstein-Maxwell's field equations in the presence of a charged black hole within the environment of charged fluid. We also comment on the nature of the photon sphere, shadow radius and the eikonal quasinormal modes in the Einstein-Maxwell cluster.

OriginalsprogEngelsk
Artikelnummer044050
TidsskriftPhysical Review D
Vol/bind107
Udgave nummer4
Antal sider12
ISSN2470-0010
DOI
StatusUdgivet - 15 feb. 2023

Bibliografisk note

Funding Information:
J. C.F thanks the Niels Bohr International Academy for hosting a visit during which part of this research was performed, and acknowledges financial support from FCT—Fundação para a Ciência e a Tecnologia of Portugal Project No. UIDB/00099/2020. V. C. is a Villum Investigator and a DNRF Chair, supported by VILLUM FONDEN (Grant No. 37766) and by the Danish Research Foundation. V. C. acknowledges financial support provided under the European Union’s H2020 ERC Advanced Grant “Black holes: gravitational engines of discovery” Grant agreement No. Gravitas–101052587. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant agreement No. 101007855. We acknowledge financial support provided by FCT/Portugal through grants 2022.01324.PTDC, PTDC/FIS-AST/7002/2020, UIDB/00099/2020 and UIDB/04459/2020. Research of S. C. is funded by the INSPIRE Faculty fellowship from DST, Government of India (Reg. No. DST/INSPIRE/04/2018/000893) and by the Start-Up Research Grant from SERB, DST, Government of India (Reg. No. SRG/2020/000409).

Publisher Copyright:
© 2023 American Physical Society.

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