414 research outputs found
Hawking-Page Phase Transition of the four-dimensional de-Sitter Spacetime with non-linear source
The interplay between a dS black hole and cosmological horizons introduces
distinctive thermodynamic behavior in a dS spacetime (for example the
well-known upper bounds of mass and entropy in Class. Quant. Grav. 37 (2020)
5). Based on this point, we present the Hawking-Page (HP) phase transition of
the four-dimensional dS spacetime with non-linear charge correction when the
effective pressure is fixed, and analyze the effects of different effective
pressures and non-linear charge corrections on HP phase transition. The
evolution of this dS spacetime undergoing the HP phase transition is also
investigated. We find that the existent curve of HP phase transition is a
closed one with two different branches. That means there exist the upper bounds
of the HP temperature and HP pressure, which is completely distinguished with
that in AdS spacetime. And with the decreasing of the distance between two
horizons, the dS spacetime at the coexistent curve of HP phase transition is
going along with different branches. Furthermore we also explore the influence
of charge and non-linear charge correction on the coexistent curve
Distributed entanglement induced by dissipative bosonic media
We describe a scheme with analytic result that allows to generate
steady-state entanglement for two atoms over a dissipative bosonic medium. The
resonant coupling between the mediating bosonic mode and cavity modes produces
three collective atomic decay channels. This dissipative dynamics, together
with the unitary process induced by classical microwave fields, drives the two
atoms to the symmetric or asymmetric entangled steady state conditional upon
the choice of the phases of the microwave fields. The effects on the
steady-state entanglement of off-resonance mediating bosonic modes are
analyzed. The entanglement can be obtained with high fidelity regardless of the
initial state and there is a linear relation in the scaling of the fidelity
with the cooperativity parameter. The fidelity is insensitive to the
fluctuation of the Rabi frequencies of the classical driving fields.Comment: to appear in Europhysics Letter
Photon orbits and phase transition for Non-Linear charged Anti-de Sitter black holes
In this work, we investigate the relationship between the photon sphere
radius and the first-order phase transition for the charged EPYM AdS black
hole. Through the analysis, we find with a certain condition there exist the
non-monotonic behaviors between the photon sphere radius, the impact parameter,
the non-linear YM charge parameter, temperature, and pressure. And both the
changes of photon sphere radius and impact parameter before and after phase
transition can be regarded as the order parameter, their critical exponents
near the critical point are equal to the same value , just like the
ordinary thermal systems. These indicate that there maybe exists a universal
relationship of gravity nearby the critical point for a black hole
thermodynamical system. Furthermore, the effect of impact parameter on the
deflect angle is also investigated
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