Dyon Production from Near-Extremal Kerr-Newman-(Anti-)de Sitter Black Holes

TL;DR

This paper analyzes the Schwinger effect in near-extremal dyonic Kerr-Newman-(A)dS black holes, deriving exact solutions and revealing how geometry influences charge emission and stability.

Contribution

It provides exact solutions for dyonic scalar fields and demonstrates the universal factorization of the Schwinger formula in the near-horizon region of these black holes.

Findings

Emission is enhanced at the AdS boundary and suppressed at the dS boundary.

Particle dragging reduces charge emission in both AdS and dS spaces.

Stability is maintained within the Breitenlohner-Freedman bound in AdS geometry.

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$_2$ 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.