Dyon production from near-extremal Kerr–Newman–(anti-)de Sitter black holes

Abstract

Using the enhanced symmetry in the near-horizon region of the near-extremal dyonic Kerr–Newman (KN) black hole in the (A)dS space, we find the exact solutions for dyonic charged scalar field in terms of the hypergeometric function and explicitly compute the Schwinger effect for the emission of electric and/or magnetic charges. The emission formula confirms a universal factorization of the Schwinger formula in the AdS$$_2$$ 2 and another Schwinger formula in the two-dimensional Rindler space determined by the effective temperature and the Hawking temperature with the chemical potentials of electric and/or magnetic charges and the angular momentum. The emission of the same species of charges from the KN black hole is enhanced in the AdS boundary while it is suppressed in the dS boundary. In addition, the dragging of particles in the KN black hole diminishes the emission of charges in both AdS and dS spaces. The AdS geometry of near-horizon gives the Breitenloher–Freedman (BF) bound, within which the stability of dyonic KN black holes is guaranteed against both the emission of charges and Hawking radiation.

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“…The near-extremal charged black holes, where the Cauchy (inner) horizon and the black hole horizon are close to each other, have a near-horizon geometry of AdS 2 × S 2 , in which a quantum field equation can be solved in terms of special function due to an enhanced symmetry [4]. Recently two of the authors (CMC and SPK) have studied the emission of near-extremal Reissner-Nordström (RN) black holes and Kerr-Newmann (KN) black holes in the dS space [5,6]. The black hole thermodynamics has been studied in the near-extremal and extremal limit of RN-dS black holes [7].…”