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Electromagnetic Perturbations of Black Holes in Gauss-Bonnet Gravity
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作者 LIU Jing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第4期647-652,共6页
This paper mainly explores the electromagnetic perturbations of black holes in Gauss-Bonnet gravity and calculates the quasinormal modes for the 5-dimensional, 6-dimensional, 7-dimensional, and 8-dimensional black hol... This paper mainly explores the electromagnetic perturbations of black holes in Gauss-Bonnet gravity and calculates the quasinormal modes for the 5-dimensional, 6-dimensional, 7-dimensional, and 8-dimensional black holes. When α increases from zero, the imaginary part of w will increase accordingly till it reaches a maximum value where it starts to decrease. When a reaches zero, the quasinormal modes will approach their Schwarzschild values. If the Gauss-Bonnet coupling parameter α is large enough, the quasinormal modes will be proportional to α and the oscillation frequency will become high consequently . When L is large enough, the minimum value of -Im ω will approach a value too. We calculate that value for different dimensions. 展开更多
关键词 Gauss-Bonnet gravity quasinormal modes electromagnetic perturbation
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Quasinormal Modes of a Noncommutative-Geometry-Inspired Schwarzschild Black Hole: Gravitational, Electromagnetic and Massless Dirac Perturbations
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作者 Jun Liang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期15-19,共5页
In our previous work [Chin. Phys. Lett. 35(2018) 010410], the quasinormal modes of massless scalar field perturbation in a noncommutative-geometry-inspired Schwarzschild black hole spacetime are studied using the th... In our previous work [Chin. Phys. Lett. 35(2018) 010410], the quasinormal modes of massless scalar field perturbation in a noncommutative-geometry-inspired Schwarzschild black hole spacetime are studied using the third-order Wentzel–Kramers–Brillouin approximative approach. In this study, we extend the work to the cases of gravitational, electromagnetic and massless Dirac perturbations. The result further confirms that the noncommutative parameter plays an important role for the quasinormal frequencies. 展开更多
关键词 NC Quasinormal Modes of a Noncommutative-Geometry-Inspired Schwarzschild Black Hole electromagnetic and Massless Dirac Perturbations GRAVITATIONAL
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Quasinormal Modes of a Black Hole with Quintessence-Like Matter and a Deficit Solid Angle for Electromagnetic Perturbation
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作者 王春艳 赵亚峰 高亚军 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第6期1101-1104,共4页
We investigate the electromagnetic perturbation around a black hole with quintessence-like matter and a deficit solid angle.The complex frequencies of the quasinormal modes of electromagnetic perturbation are evaluate... We investigate the electromagnetic perturbation around a black hole with quintessence-like matter and a deficit solid angle.The complex frequencies of the quasinormal modes of electromagnetic perturbation are evaluated by the third-order WKB approximation.The results show that the electromagnetic perturbation around the black hole damps more slowly owing to the presence of the quintessence-like.The phenomenon can be distinguished from the black hole only with a deficit angle. 展开更多
关键词 electromagnetic perturbation quasinormal frequencies WKB approximation
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Stability of Quark Star Models
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作者 M.Azam S.A.Mardan M.A.Rehman 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第5期575-584,共10页
In this paper,we investigate the stability of quark stars with four different types of inner matter configurations;isotropic,charged isotropic,anisotropic and charged anisotropic by using the concept of cracking.For t... In this paper,we investigate the stability of quark stars with four different types of inner matter configurations;isotropic,charged isotropic,anisotropic and charged anisotropic by using the concept of cracking.For this purpose,we have applied local density perturbations technique to the hydrostatic equilibrium equation as well as on physical parameters involved in the model.We conclude that quark stars become potentially unstable when inner matter configuration is changed and electromagnetic field is applied. 展开更多
关键词 quark stars cracking density perturbations electromagnetic field
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