Si-Jie Gao has recently investigated Hawking radiation from spherically symmetrical gravitational collapse to an extremal R-N black hole for a real scalar field. Especially he estimated the upper bound for the expecte...Si-Jie Gao has recently investigated Hawking radiation from spherically symmetrical gravitational collapse to an extremal R-N black hole for a real scalar field. Especially he estimated the upper bound for the expected number of particles in any wave packet belonging to spontaneously produced from the state , which confirms the traditional belief that extremal black holes do not radiate particles. Making some modifications, we demonstrate that the analysis can go through for a charged scalar field.展开更多
Neglecting the self-force, self-energy and radiative effects, we follow the spirit of Wald＇s gedanken experiment and further discuss whether an extremal Kerr-Newman-AdS （KNA） black hole can turn into a naked singul...Neglecting the self-force, self-energy and radiative effects, we follow the spirit of Wald＇s gedanken experiment and further discuss whether an extremal Kerr-Newman-AdS （KNA） black hole can turn into a naked singularity when it captures charged and spinning massive particles. It is found that feeding a test particle into an extremal KNA black hole could lead to a violation of cosmic censorship for the black hole.展开更多
基金The project supported in part by National Natural Science Foundation of China under Grant No.90103019+2 种基金the Doctoral Programme Foundation of Institute of Higher Educationthe Ministry of Education of China under Grant No.2000000147
文摘Si-Jie Gao has recently investigated Hawking radiation from spherically symmetrical gravitational collapse to an extremal R-N black hole for a real scalar field. Especially he estimated the upper bound for the expected number of particles in any wave packet belonging to spontaneously produced from the state , which confirms the traditional belief that extremal black holes do not radiate particles. Making some modifications, we demonstrate that the analysis can go through for a charged scalar field.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11275099,11435006 and 11405130
文摘Neglecting the self-force, self-energy and radiative effects, we follow the spirit of Wald＇s gedanken experiment and further discuss whether an extremal Kerr-Newman-AdS （KNA） black hole can turn into a naked singularity when it captures charged and spinning massive particles. It is found that feeding a test particle into an extremal KNA black hole could lead to a violation of cosmic censorship for the black hole.
