Screening an extremal black hole with a thin shell of exotic matter

Abstract

We study the possibility of shielding a regular extremal black hole by means of a matter thin-shell. While the surface energy density $\sigma$ on the static shell is negative, the tangential pressures $p$ are positive, both of them being finite when the shell approaches the black hole horizon. The Darmois-Israel junction conditions are used to find $\sigma$ and $p$ in terms of the radius $a$ of the shell. The surface gravitational energy $E_S$ is computed, keeping track of the pressure contribution. The stability conditions are briefly investigated.

7 pages, no figures, minor changes, published in Physics of the Dark Universe 14 (2016) 1-3

References in corpus (6)

• On a regular charged black hole with a nonlinear electric source
• Stability of charged thin shells
• Charged shells in a (2+1)-dimensional spacetime
• Stability of thin-shell interfaces inside compact stars
• Screening of the Reissner-Nordström charge by a thin-shell of dust matter
• On a particular Morris - Thorne wormhole

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• Scalar Perturbation Around Rotating Regular Black Hole: Superradiance Instability and Quasinormal Modes