In this paper,we study the thermodynamics and the weak cosmic censorship conjecture of the nonlinear electrodynamics black hole under the scattering of a charged complex scalar field.According to the energy and charge...In this paper,we study the thermodynamics and the weak cosmic censorship conjecture of the nonlinear electrodynamics black hole under the scattering of a charged complex scalar field.According to the energy and charge fluxes of the scalar field,the variations of this black hole’s energy and charge can be calculated during an infinitesimal time interval.With scalar field scattering,the variation of the black hole is calculated in the extended and normal phase spaces.In the normal phase space,the cosmological constant and the normalization parameter are fixed,and the first and second laws of thermodynamics can also be satisfied.In the extended phase space,the cosmological constant and the normalization parameter are considered as thermodynamic variables,and the first law of thermodynamics is valid,but the second law of thermodynamics is not valid.Furthermore,the weak cosmic censorship conjecture is both valid in the extended and normal phase spaces.展开更多
In this paper, we investigate effects of the minimal length on the Schwinger mechanism using the quantum field theory （QFT） incorporating the minimal length. We first study the Schwinger mechanism for scalar fields ...In this paper, we investigate effects of the minimal length on the Schwinger mechanism using the quantum field theory （QFT） incorporating the minimal length. We first study the Schwinger mechanism for scalar fields in both usual QFT and the deformed QFT. The same calculations are then performed in the case of Dirac particles. Finally, we discuss how our results imply for the corrections to the Unruh temperature and the Hawking temperature due to the minimal length.展开更多
In this paper, we address the spectra of simple harmonic oscillators based on the generalized uncertainty principle (GUP) with a Kaluza-Klein compactified extra dimension. We show that in this scenario, to make the re...In this paper, we address the spectra of simple harmonic oscillators based on the generalized uncertainty principle (GUP) with a Kaluza-Klein compactified extra dimension. We show that in this scenario, to make the results compatible with experiments, the minimal length scale equals to the radius of compact extra dimension.展开更多
It was shown observationally that there existed a close relation between flare occur-rence and filament motion at the same time. Van Tend and Kuperus andmany authors afterwards studied theoretically the physical relat...It was shown observationally that there existed a close relation between flare occur-rence and filament motion at the same time. Van Tend and Kuperus andmany authors afterwards studied theoretically the physical relationship between flare processand the evolution and motion of the filament current in active regions. However, due tothe difficulty in obtaining observational material of high quality and the complexity展开更多
Many authors have studied the regularity and properties of evolution and eruption of the helical prominence observationally or theoretically. We proposed that Lundquist field may be a good configuration to describe th...Many authors have studied the regularity and properties of evolution and eruption of the helical prominence observationally or theoretically. We proposed that Lundquist field may be a good configuration to describe the inner magnetic distribution of the helical promincence by analyzing this kind of quiescent and eruptive prominences. In this note,we discuss the stable criterion of Lundquist field according to energy principle and compare theory with observational data of 28 helical prominences. This work not only has confirmed the close relation between the Lundquist field and the helical prominence, but al-展开更多
Super-entropic black holes possess finite-area but noncompact event horizons and violate the reverse iso-perimetric inequality.It has been conjectured that such black holes always have negative specific heat at consta...Super-entropic black holes possess finite-area but noncompact event horizons and violate the reverse iso-perimetric inequality.It has been conjectured that such black holes always have negative specific heat at constant volume C_(V)or negative specific heat at constant pressure C_(p)whenever Cy>0,making them unstable in extended thermodynamics.In this paper,we describe a test of this instability conjecture with a family of nonlinear electro-dynamic black holes,namely 3D Einstein-Bom-Infeld(EBI)AdS black holes.Our results show that when nonlinear electrodynamics effects are weak,the instability conjecture is valid.However,the conjecture can be violated in some parameter region when nonlinear electrodynamics effects are strong enough.This observation thus provides a counter example to the instability conjecture,which suggests that super-entropic black holes may be thermodynamically stable.展开更多
The thermodynamics and overcharging problem in RN-AdS black holes with a cloud of strings and quintessence are investigated by the absorption of scalar particles and fermions in extended phase space.The cosmological c...The thermodynamics and overcharging problem in RN-AdS black holes with a cloud of strings and quintessence are investigated by the absorption of scalar particles and fermions in extended phase space.The cosmological constant is treated as the pressure of the black hole.The parameters related to quintessence and the cloud of strings are treated as thermodynamic variables.We find that the first law of thermodynamics is satisfied and the second law of thermodynamics is indefinite.Furthermore,we find that near-extremal and extremal black holes cannot be overcharged.展开更多
Various quantum theories of gravity predict the existence of a minimal measurable length.In this paper,we study effects of the minimal length on the motion of a particle in the Rindler space under a harmonic potential...Various quantum theories of gravity predict the existence of a minimal measurable length.In this paper,we study effects of the minimal length on the motion of a particle in the Rindler space under a harmonic potential.This toy model captures key features of particle dynamics near a black hole horizon and allows us to make three observations.First,we find that chaotic behavior becomes stronger with increases in minimal length effects,leading predominantly to growth in the maximum Lyapunov characteristic exponents,while the KAM curves on Poincarésurfaces of a section tend to disintegrate into chaotic layers.Second,in the presence of the minimal length effects,it can take a finite amount of Rindler time for a particle to cross the Rindler horizon,which implies a shorter scrambling time of black holes.Finally,the model shows that some Lyapunov characteristic exponents can be greater than the surface gravity of the horizon,violating the recently conjectured universal upper bound.In short,our results reveal that quantum gravity effects may make black holes prone to more chaos and faster scrambling.展开更多
基金supported in part by NSFC(Grant No.11375121,11747171,11747302 and 11847305)Natural Science Foundation of Chengdu University of TCM(Grants No.ZRYY1729 and ZRQN1656)+2 种基金Discipline Talent Promotion Program of Xinglin Scholars(Grant No.QNXZ2018050)The Key Fund Project for Education Department of Sichuan(Grant No.18ZA0173)Sichuan University Students Platform for Innovation and Entrepreneurship Training Program(Grant No.C2019104639).
文摘In this paper,we study the thermodynamics and the weak cosmic censorship conjecture of the nonlinear electrodynamics black hole under the scattering of a charged complex scalar field.According to the energy and charge fluxes of the scalar field,the variations of this black hole’s energy and charge can be calculated during an infinitesimal time interval.With scalar field scattering,the variation of the black hole is calculated in the extended and normal phase spaces.In the normal phase space,the cosmological constant and the normalization parameter are fixed,and the first and second laws of thermodynamics can also be satisfied.In the extended phase space,the cosmological constant and the normalization parameter are considered as thermodynamic variables,and the first law of thermodynamics is valid,but the second law of thermodynamics is not valid.Furthermore,the weak cosmic censorship conjecture is both valid in the extended and normal phase spaces.
基金Supported by National Natural Science Foundation of China under Grant Nos.11005016,11175039,and 11375121the Fundamental Research Funds for the Central Universities
文摘In this paper, we investigate effects of the minimal length on the Schwinger mechanism using the quantum field theory （QFT） incorporating the minimal length. We first study the Schwinger mechanism for scalar fields in both usual QFT and the deformed QFT. The same calculations are then performed in the case of Dirac particles. Finally, we discuss how our results imply for the corrections to the Unruh temperature and the Hawking temperature due to the minimal length.
文摘In this paper, we address the spectra of simple harmonic oscillators based on the generalized uncertainty principle (GUP) with a Kaluza-Klein compactified extra dimension. We show that in this scenario, to make the results compatible with experiments, the minimal length scale equals to the radius of compact extra dimension.
基金Project supported by the National Natural Science Foundation of China.
文摘It was shown observationally that there existed a close relation between flare occur-rence and filament motion at the same time. Van Tend and Kuperus andmany authors afterwards studied theoretically the physical relationship between flare processand the evolution and motion of the filament current in active regions. However, due tothe difficulty in obtaining observational material of high quality and the complexity
基金Project supported by the National Natural Science Foundation of China
文摘Many authors have studied the regularity and properties of evolution and eruption of the helical prominence observationally or theoretically. We proposed that Lundquist field may be a good configuration to describe the inner magnetic distribution of the helical promincence by analyzing this kind of quiescent and eruptive prominences. In this note,we discuss the stable criterion of Lundquist field according to energy principle and compare theory with observational data of 28 helical prominences. This work not only has confirmed the close relation between the Lundquist field and the helical prominence, but al-
基金Supported in part by the National Natural Science Foundation of China(11005016,11875196,11375121)。
文摘Super-entropic black holes possess finite-area but noncompact event horizons and violate the reverse iso-perimetric inequality.It has been conjectured that such black holes always have negative specific heat at constant volume C_(V)or negative specific heat at constant pressure C_(p)whenever Cy>0,making them unstable in extended thermodynamics.In this paper,we describe a test of this instability conjecture with a family of nonlinear electro-dynamic black holes,namely 3D Einstein-Bom-Infeld(EBI)AdS black holes.Our results show that when nonlinear electrodynamics effects are weak,the instability conjecture is valid.However,the conjecture can be violated in some parameter region when nonlinear electrodynamics effects are strong enough.This observation thus provides a counter example to the instability conjecture,which suggests that super-entropic black holes may be thermodynamically stable.
基金Supported in part by NSFC(11747171)Natural Science Foundation of Chengdu University of TCM(ZRYY1729,ZRYY 1921)+1 种基金Discipline Talent Promotion Pro-gram of/Xinglin Scholars(QNXZ2018050)the key fund project for Education Department of Sichuan(18ZA0173)。
文摘The thermodynamics and overcharging problem in RN-AdS black holes with a cloud of strings and quintessence are investigated by the absorption of scalar particles and fermions in extended phase space.The cosmological constant is treated as the pressure of the black hole.The parameters related to quintessence and the cloud of strings are treated as thermodynamic variables.We find that the first law of thermodynamics is satisfied and the second law of thermodynamics is indefinite.Furthermore,we find that near-extremal and extremal black holes cannot be overcharged.
基金Supported in part by NSFC(11875196,11375121,1005016)the Fundamental Research Funds for the Central Universities,Natural Science Foundation of Chengdu University of TCM(ZRYY 1729,ZRYY1921)+3 种基金Disciline Talent Promotion Program of/Xinglin Scholars(QNX22018050)the key fund project for Educa-tion Department of Sichuan(18ZA0173)the open fund of State Key Laboratory of Enironment friendly Energy Materials of Southwest University of Science and Technology(17kfk08)Special Talent Projccts of Chizhou University(2019YJRC001)。
文摘Various quantum theories of gravity predict the existence of a minimal measurable length.In this paper,we study effects of the minimal length on the motion of a particle in the Rindler space under a harmonic potential.This toy model captures key features of particle dynamics near a black hole horizon and allows us to make three observations.First,we find that chaotic behavior becomes stronger with increases in minimal length effects,leading predominantly to growth in the maximum Lyapunov characteristic exponents,while the KAM curves on Poincarésurfaces of a section tend to disintegrate into chaotic layers.Second,in the presence of the minimal length effects,it can take a finite amount of Rindler time for a particle to cross the Rindler horizon,which implies a shorter scrambling time of black holes.Finally,the model shows that some Lyapunov characteristic exponents can be greater than the surface gravity of the horizon,violating the recently conjectured universal upper bound.In short,our results reveal that quantum gravity effects may make black holes prone to more chaos and faster scrambling.
