A charged black hole in Einstein-cubic gravity, built from first-law consistency and a continued fraction metric, amplifies charged scalar waves below the standard Reissner-Nordstrom superradiance threshold, with stronger amplification for larger charge and larger cubic coupling.
Effect of scalar field mass on gravitating charged scalar solitons and black holes in a cavity
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abstract
We study soliton and black hole solutions of Einstein charged scalar field theory in cavity. We examine the effect of introducing a scalar field mass on static, spherically symmetric solutions of the field equations. We focus particularly on the spaces of soliton and black hole solutions, as well as studying their stability under linear, spherically symmetric perturbations of the metric, electromagnetic field, and scalar field.
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Superradiance of Charged Static Black Hole in Cubic Gravity
A charged black hole in Einstein-cubic gravity, built from first-law consistency and a continued fraction metric, amplifies charged scalar waves below the standard Reissner-Nordstrom superradiance threshold, with stronger amplification for larger charge and larger cubic coupling.