Extraction energy from charged Vaidya black hole via the Penrose process

被引:7
作者
Vertogradov, Vitalii [1 ,2 ]
机构
[1] Herzen state Pedag Univ Russia, Phys Dept, 48 Moika Emb, St Petersburg 191186, Russia
[2] SAO RAS, SPb branch, 65 Pulkovskoe Rd, St Petersburg 196140, Russia
关键词
black hole; energy extraction; generalized ergosphere; charged Vaidya spacetime; Penrose process;
D O I
10.1088/1572-9494/acc018
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 cannot extract large energies from a black hole if the velocities of ingoing and outgoing particles are of the same order. In the case of the extremal black hole, we show that the upper limit is restricted by the absolute value of the electric charge per mass.
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页数:5
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