The discovery of ＂twin quasi-stellar objects＂ arose interests among astronomers and astrophysicists to study gravitational leasing problem. Deviation of light from straight path is caused by the presence of massive ...The discovery of ＂twin quasi-stellar objects＂ arose interests among astronomers and astrophysicists to study gravitational leasing problem. Deviation of light from straight path is caused by the presence of massive objects, i.e., the presence of gravitational field according to the general theory of relativity. It is shown that the low energy effective field theory on D-branes is of the Born-Infeld type. In this work a Born-Infeld type gravitational field is pasttflated. An explicit representation of the angular deviation of light path is derived based on the space time metric in the Born-Infeld theory.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
文摘The discovery of ＂twin quasi-stellar objects＂ arose interests among astronomers and astrophysicists to study gravitational leasing problem. Deviation of light from straight path is caused by the presence of massive objects, i.e., the presence of gravitational field according to the general theory of relativity. It is shown that the low energy effective field theory on D-branes is of the Born-Infeld type. In this work a Born-Infeld type gravitational field is pasttflated. An explicit representation of the angular deviation of light path is derived based on the space time metric in the Born-Infeld theory.
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.
