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Quasi-bound state resonances of charged massive scalar fields in the near-extremal Reissner-Nordstr\"om black-hole spacetime

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arxiv 1705.04726 v1 pith:U3W2DW44 submitted 2017-05-12 hep-th astro-ph.HEgr-qc

classification hep-thastro-ph.HEgr-qc
keywords black-holechargedfieldsquasi-boundreissner-nordstrscalarspacetimecomposed
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The quasi-bound states of charged massive scalar fields in the near-extremal charged Reissner-Nordstr\"om black-hole spacetime are studied {\it analytically}. These discrete resonant modes of the composed black-hole-field system are characterized by the physically motivated boundary condition of ingoing waves at the black-hole horizon and exponentially decaying (bounded) radial eigenfunctions at spatial infinity. Solving the Klein-Gordon wave equation for the linearized scalar fields in the black-hole spacetime, we derive a remarkably compact analytical formula for the complex frequency spectrum which characterizes the quasi-bound state resonances of the composed Reissner-Nordstr\"om-black-hole-charged-massive-scalar-field system.

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    Inside the extremal dyonic Kerr-Sen black hole, scalar field modes have purely imaginary frequencies, so they do not propagate; the growing modes can destroy the region containing closed timelike curves, supporting th...

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