Extraction Energy From Charged Vaidya Black Hole Via Penrose Process

TL;DR

This paper explores the possibility of energy extraction from a charged Vaidya black hole using the Penrose process, analyzing the ergosphere's properties and efficiency limits.

Contribution

It introduces the concept of a temporary generalized ergosphere in charged Vaidya spacetime and examines the limitations on energy extraction via the Penrose process.

Findings

The generalized ergosphere is temporary and bounded.

No closed orbits for negative energy particles inside the ergosphere.

Energy extraction efficiency is limited, preventing large energy gains.

Abstract

In this paper, we consider the analogy of the Penrose process in Charged Vaidya spacetime. We calculate the border of the generalized ergosphere, in which the charged particles with negative energy might exist, and show that it is temporary. We show that there are no closed orbits for particles with negative energy inside the generalized ergosphere. We investigate the question about the efficiency of the Penrose process and show that one can't extract large energies from a black hole.