A global monopole lowers the superradiance threshold frequency of Reissner-Nordström(-AdS) black holes and shrinks the charged-scalar-field instability window, with the paper's time-scale claims internally inconsistent.
(54) Taking the limit x→∞ and using F (α,β ;γ; 0) = 1, we see that the solution behaves as, R∼ (−1)β2 [ Cx −1 4 ( 3+ √ 9+µ2𝓁2 ) +D ]
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Superradiance of a Global Monopole in Reissner-Nordstr\"{o}m(-AdS) Space-time
A global monopole lowers the superradiance threshold frequency of Reissner-Nordström(-AdS) black holes and shrinks the charged-scalar-field instability window, with the paper's time-scale claims internally inconsistent.