Electromagnetic radiation reaction and energy extraction from black holes: The tail term cannot be ignored

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We study electromagnetic radiation reaction in curved space and the dynamics of radiating charged particles. The equation of motion for such particles is the DeWitt-Brehme equation, and it contains a particularly complicated, nonlocal, tail term. It has been claimed that the tail term can be neglected in certain magnetized black hole spacetimes, and that radiation reaction may then lead to energy extraction (“orbital widening”) in the absence of an ergoregion. We show that such claims are incorrect, at least in the Newtonian limit: the tail term can never be neglected consistently in the relevant scenarios, and when it is included the reported energy extraction no longer occurs. Thus, previous results are called into question by our work.
OriginalsprogEngelsk
Artikelnummer064046
TidsskriftPhysical Review D
Vol/bind107
Udgave nummer6
Antal sider8
ISSN2470-0010
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
We acknowledge useful feedback from and exchanges with Martin Kološ, Arman Tursunov, and Dmitry Gal’tsov. V. C. is a Villum Investigator and a DNRF Chair, supported by VILLUM Foundation (Grant No. VIL37766) and the DNRF Chair program (Grant No. DNRF162) by the Danish National Research Foundation. V. C. and J. S. S. acknowledge financial support provided under the European Union’s H2020 ERC Advanced Grant “Black holes: gravitational engines of discovery” Grant Agreement No. Gravitas–101052587. Views and opinions expressed are however those of the author only and do not necessarily reflect those of the European Union or the European Research Council. Neither the European Union nor the granting authority can be held responsible for them. 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 No. 2022.01324.PTDC, PTDC/FIS-AST/7002/2020, No. UIDB/00099/2020, and No. UIDB/04459/2020.

Publisher Copyright:
© 2023 American Physical Society.

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