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ISCOs and the weak gravity conjecture bound in Gauss-Bonnet gravity

Published 11 Apr 2024 in hep-th and gr-qc | (2404.07980v1)

Abstract: We study circular orbits of charged particles in spherically symmetric AdS black holes in Gauss-Bonnet gravity in arbitrary dimensions, and their limiting ISCOs (innermost stable circular orbits). The dual interpretation is in terms of certain conformal field theory (CFT) operators, whose anomalous dimensions can be extracted from the binding energy of charged probes in the bulk, in a large radius limit. The charge to mass ratio of particles in the black hole background is found to increase with the Gauss-Bonnet coupling parameter $\widetilde{\alpha}$, consistent with the Weak Gravity Conjecture (WGC) bound known for self-repulsive particles. The radius of the ISCOs decreases with $\widetilde{\alpha}$, existing until the limit set by the WGC bound.

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