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Dynamics of Particles Around a regular black hole with Nonlinear Electrodynamics

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Communications in Theoretical Physics 2016年第11期65卷 509-516页

作者： Abdul Jawad Farhad Ali Mubasher Jamil Ujjal Debnath Department of Mathematics COMSATS Institute of Information Technology Department of Mathematics Kohat University of Science and Technology Department of Mathematics School of Natural Sciences (SNS) National University of Sciences and Technology (NUST) Department of Mathematics Indian Institute of Engineering Science and Technology

We investigate the dynamics of a charged particle being kicked off from its circular orbit around a regular black hole by an incoming massive particle in the presence of magnetic field. The resulting escape velocity, escape energy and the effective potential are analyzed. It is shown that the presence of even a very weak magnetic field helps the charged particles in escaping the gravitational field of the black hole. Moreover the effective force acting on the particle visibly reduces with distance. Thus particle near the black hole will experience higher effective force as compared to when it is far away.

关键词： center of mass energy escape velocity electrodynamics regular black hole

Neutral regular black hole solution in generalized Rastall gravity

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Chinese Physics C 2019年第8期43卷 81-85页

作者： Kai Lin Wei-Liang Qian Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074HubeiChina Escola de Engenharia de Lorena Universidade de S?o Paulo12602-810LorenaSPBrazil Faculdade de Engenharia de Guaratingueta Universidade Estadual Paulista12516-410GuaratinguetaSPBrazil Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

We investigate the static, spherically symmetric regular black hole solutions in the generalized Rastall gravity. In particular, the prescription of Rastall gravity implies that the present approach does not necessarily involve nonlinear electrodynamics. Subsequently, the resulting regular black hole solutions can be electrically and magnetically neutral. The general properties of the regular black hole solutions are explored. Moreover, specific solutions are derived and discussed, particularly regarding the parameter related to the degree of violation of the energy-momentum conservation in the Rastall theory.

关键词： regular black hole generalized Rastall gravity static spherically symmetrical spacetime

regular black holes with Cosmological Constant

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Communications in Theoretical Physics 2006年第3X期46卷 453-460页

作者： MO Wen-Juan CAI Rong-Gen SU Ru-Keng Department of Physics Fudan University Shanghai 200433 China Institute of Theoretical Physics the Chinese Academy of Sciences. P.O. Box 2735 Beijing 100080 China China Center of Advanced Science and Technology (World Laboratory) P.O. Box 8730 Beijing 100080 China

We present a class of regular black holes with cosmological constant A in nonlinear electrodynamics. Instead of usual singularity behind black hole horizon, all fields and curvature invariants are regular everywhere for the regular black holes. Through gauge invariant approach, the linearly dynamical stability of the regular black hole is studied. In odd-parity sector, we find that the A term does not appear in the master equations of perturbations, which shows that the regular black hole is stable under odd-parity perturbations. On the other hand, for the even-parity sector, the master equations are more complicated than the case without the cosmological constant. We obtain the sufficient conditions for stability of the regular black hole. We also investigate the thermodynamic properties of the regular black hole. and find that those thermodynamic quantities do not satisfy the differential form of first law of black hole thermodynamics. The reason for violating the first law is revealed.

关键词： regular black hole stability thermodynamics

New black-to-white hole solutions with improved geometry and energy conditions

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 30-43页

作者： Zhongwen Feng Yi Ling Xiaoning Wu Qingquan Jiang School of Physics and Astronomy China West Normal UniversityNanchong 637009China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China Institute of Mathematics Academy of Mathematics and System Science and Hua Loo-Keng Key Laboratory of MathematicsChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100190China

We construct new black-to-white hole solutions which connect the geometry of spacetime at some gluing surface inside the *** continuity of the metric can be guaranteed up to the arbitrary order which is controlled by the power factor *** sort of black-to-white holes is characterized by the sub-Planckian scalar curvature,independent of the mass of black-to-white *** importantly,we show that the energy condition is only violated within a small region near the gluing *** geodesics of particles within the region from black hole to white hole is also *** turns out that the matter falling into the black hole may pass through the center without singularity and come out from the white *** scenario provides novel ideas for understanding the information loss paradox in traditional black hole physics.

关键词： regular black hole energy condition singularity quantum gravity

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Shadow thermodynamics of the Hayward-AdS black hole

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Chinese Physics C 2023年第6期47卷 167-176页

作者：罗智喻豪曹硕李瑾 Physics Department Chongqing UniversityChongqing 401331China Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 401331China Department of Astronomy Beijing Normal UniversityBeijing 100875China

In this paper,the phase structure of the Hayward-anti-de Sitter(AdS)black hole(BH)is studied using shadow *** has been found that the shadow radius is a monotonic function of the horizon radius and can therefore play an equivalent role to the horizon radius in characterizing the thermodynamics of the Hayward-AdS *** thermodynamic phase transition(PT)of the Hayward-AdS BH is investigated with the shadow *** is shown that as the magnetic charge increases,the shadow radius becomes larger,while the coexistence temperature becomes *** thermal profile of the Hayward-AdS BH is established by combining the temperature diagram and the shadow cast diagram,which shows that for a fixed magnetic charge,the temperature of the Hayward-AdS BH increases with the pressure whereas the region of the thermal profile decreases with the *** particular,the temperature of the Hayward-AdS BH follows an N-type change trend when it is smaller than the critical *** implies that the BH shadow may be used to investigate the thermodynamics of the Hayward-AdS BH.

关键词： black hole shadow black hole thermodynamics regular black hole

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Comparison of thermodynamic behaviors of two regular-AdS black holes

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Communications in Theoretical Physics 2022年第2期74卷 99-104页

作者： Sen Guo Ya-Ling Huang En-Wei Liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China School of Electrical Engineering SouthWest JiaoTong UniversityChengdu 610031China

Considering the negative cosmological constant of an anti-de Sitter(AdS)background as a positive thermodynamic pressure in the extended phase space,we investigate the P-υ critical behavior and of the cooling-heating phase transition of the regular Hayward-AdS(HAd S)black hole(BH),and compare the difference of some thermodynamic processes in both the HAdS BH and the BardeenAdS(BAdS)*** found that the phase transition of the BAdS BH tends to be more the van der Waals(vdW)phase *** the cooling-heating phase transition,we obtained the inversion curves of the HAdS BH are always higher than the BAdS BH under the same pressure and magnetic *** also compare the smallest existence mass,the zero-temperature remnant,and the critical magnetic charge for these two *** results suggested that the inner horizon and the outer horizon of the Hayward BH are easier to merge,and the singularity is easier to expose.

关键词： regular black hole phase transition thermodynamic