Overcharging a Reissner-Nordstr\"om Taub-NUT regular black hole

TL;DR

This paper explores whether charged particles or fields can overcharge a charged Taub-NUT regular black hole, potentially destroying its event horizon and revealing its interior, with findings differing between extremal and near-extremal cases.

Contribution

It investigates the overcharging process of charged Taub-NUT regular black holes via particle absorption and scalar scattering, revealing conditions under which horizons can be destroyed.

Findings

Extremal charged Taub-NUT black holes cannot be overcharged.

Near-extremal charged Taub-NUT black holes can have their horizons destroyed.

Continuous charge and energy crossing may prevent overcharging in near-extremal cases.

Abstract

The destruction of a regular black hole event horizon might provide us the possibility to access regions inside black hole event horizon. This paper investigates the possibility of overcharging a charged Taub-NUT regular black hole via the scattering of a charged field and the absorption of a charged particle. For the charged scalar field scattering, both the near-extremal and extremal charged Taub-NUT regular black holes cannot be overcharged. For the test charged particle absorption, the result shows that the event horizon of the extremal charged Taub-NUT regular black hole still exists while the event horizon of the near-extremal one can be destroyed. However, if the charge and energy cross the event horizon in a continuous path, the near-extremal charged Taub-NUT regular black hole might not be overcharged.