Schwinger Effect from Near-extremal Black Holes in (A)dS Space

Abstract

We study the Schwinger effect in near-extremal Reissner-Nordström (RN) black holes with electric and/or magnetic charges in the (Anti-) de Sitter (AdS) space. The formula for the Schwinger effect takes a universal form for near-extremal black holes with the near-horizon geometry of ${\mathrm{AdS}}_2\times S^2$ and with the proper radii for the ${\mathrm{AdS}}_2$ space and the two-sphere $S^2$, regardless of the asymptotically flat or (A)dS space. The asymptotic AdS boundary enhances and the dS boundary suppresses the Schwinger effect and the small radius of the AdS (dS) space reinforces the enhancement and suppression.

8 pages, 4 figures

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• Vacuum instability in time-dependent electric fields. New example of exactly solvable case
• Dyon Production from Near-Extremal Kerr-Newman-(Anti-)de Sitter Black Holes