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      Mergers of Charged Black Holes: Gravitational Wave Events, Short Gamma-Ray Bursts, and Fast Radio Bursts

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          Abstract

          The discoveries of GW 150914, GW 151226, and LVT 151012 suggest that double black hole (BH-BH) mergers are common in the universe. If at least one of the two merging black holes carries certain amount of charge, possibly retained by a rotating magnetosphere, the inspiral of a BH-BH system would drive a global magnetic dipole normal to the orbital plane. The rapidly evolving magnetic moment during the merging process would drive a Poynting flux with an increasing wind power. The magnetospheric activities during the final phase of the merger would make a fast radio burst (FRB) if the BH charge can be as large as a factor of \(\hat q \sim (10^{-9}-10^{-8})\) of the critical charge \(Q_c\) of the BH. At large radii, dissipation of the Poynting flux energy in the outflow would power a short duration high-energy transient, which would appear as a detectable short-duration gamma-ray burst (GRB) if the charge can be as large as \(\hat q \sim (10^{-5}-10^{-4})\). The putative short GRB coincident with GW 150914 recorded by Fermi GBM may be interpreted with this model. Future joint GW/GRB/FRB searches would lead to a measurement or place a constraint on the charges carried by isolate black holes.

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          Author and article information

          Journal
          2016-02-14
          2016-07-12
          Article
          10.3847/2041-8205/827/2/L31
          1602.04542

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          5 pages, more discussion on BH electrodynamics and origin of BH charge, final version to appear in ApJL
          astro-ph.HE gr-qc

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