Can quasicircular mergers of charged black holes produce extremal black holes

Gabriele Bozzola, Vasileios Paschalidis

Research output: Contribution to journalArticlepeer-review


In contrast to energy and angular momentum, electric charge is conserved in mergers of charged black holes. This opens up the possibility for the remnant to have Kerr-Newman parameter χ2+λ2 greater than 1 (with χ and λ being the black hole dimensionless spin and dimensionless charge, respectively), which is forbidden by the cosmic censorship conjecture. In this paper, we investigate whether a naked singularity can form in quasicircular mergers of charged binary black holes. We extend a theoretical model to estimate the final properties of the remnant left by quasicircular mergers of binary black holes to the charged case. We validate the model with numerical-relativity simulations, finding agreement at the percent level. We then use our theoretical model to argue that while naked singularities cannot form following quasicircular mergers of nonspinning charged binary black holes, it is possible to produce remnants that are arbitrarily close to the extremal limit.

Original languageEnglish (US)
Article number064010
JournalPhysical Review D
Issue number6
StatePublished - Sep 15 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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