For charged, massive scalar fields around Reissner-Nordström de Sitter black holes, the effective potential has a single barrier for ℓ≥1, and the critical mass below which damping is anomalous is ℓ-independent for zero field charge.
Cosmic Censorship: As Strong As Ever
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abstract
Spacetimes which have been considered counter-examples to strong cosmic censorship are revisited. We demonstrate the classical instability of the Cauchy horizon inside charged black holes embedded in de Sitter spacetime for all values of the physical parameters. The relevant modes which maintain the instability, in the regime which was previously considered stable, originate as outgoing modes near to the black hole event horizon. This same mechanism is also relevant for the instability of Cauchy horizons in other proposed counter-examples of strong cosmic censorship.
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Quasinormal frequencies in Reissner-Nordstr\"om de Sitter black holes: constraints from space-time and scalar field parameters
For charged, massive scalar fields around Reissner-Nordström de Sitter black holes, the effective potential has a single barrier for ℓ≥1, and the critical mass below which damping is anomalous is ℓ-independent for zero field charge.