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Signatures from metastable oppositely-charged black hole binaries in scalar Gauss-Bonnet gravity

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arxiv 2505.14785 v1 pith:PAYLLGSL submitted 2025-05-20 gr-qc

Signatures from metastable oppositely-charged black hole binaries in scalar Gauss-Bonnet gravity

Guillermo Lara , Maxence Corman , Peter James Nee , Harald P. Pfeiffer , Nils L. Vu , Nikolas A. Wittek , Marceline S. Bonilla , Alexander Carpenter
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Nils Deppe Lawrence E. Kidder Prayush Kumar Geoffrey Lovelace Alexandra Macedo Iago B. Mendes Kyle C. Nelli Mark A. Scheel William Throwe
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classification gr-qc
keywords blackgravityholesscalarbinariesholeinspiraloppositely-charged
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We conduct numerical simulations of inspiraling, oppositely-charged black holes in the class of scalar-Gauss-Bonnet theories that exhibit spontaneous black hole scalarization. For quasi-circular, equal-mass binaries near the existence threshold for scalarized solutions, we find a new phenomenon whereby one of the component black holes can suddenly flip the sign of its scalar charge during the inspiral. We confirm this phenomenon with two independent codes and identify two key signatures thereof: a change in the dominant scalar radiation channel (from dipolar to quadrupolar), and, strikingly, the introduction of eccentricity in the orbit. This scenario offers a concrete example of potential nonlinear departures from general relativity in the inspiral of binary black holes in alternative theories of gravity and is of relevance for the development of new tests of gravity.

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Cited by 7 Pith papers

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