Two-dimensional quantum-corrected black hole in a finite size cavity

Abstract

We consider the gravitation-dilaton theory (not necessarily exactly solvable), whose potentials represent a generic linear combination of an exponential and linear functions of the dilaton. A black hole, arising in such theories, is supposed to be enclosed in a cavity, where it attains thermal equilibrium, whereas outside the cavity the field is in the Boulware state. We calculate quantum corrections to the Hawking temperature $T_H$, with the contribution from the boundary taken into account. Vacuum polarization outside the shell tend to cool the system. We find that, for the shell to be in the thermal equilibrium, it cannot be placed too close to the horizon. The quantum corrections to the mass due to vacuum polarization vanish in spite of non-zero quantum stresses. We discuss also the canonical boundary conditions and show that accounting for the finiteness of the system plays a crucial role in some theories (e.g., CGHS), where it enables to define the stable canonical ensemble, whereas consideration in an infinite space would predict instability.

21 pages. In v.2 misprints corrected. To appear in Phys. Rev. D

References in corpus (5)

• Dilaton Gravity in Two Dimensions
• Positive specific heat of the quantum corrected dilaton black hole
• Boulware state and semiclassical thermodynamics of black holes in a cavity
• Regular self-consistent geometries with infinite quantum backreaction in 2D dilaton gravity and black hole thermodynamics: unfamiliar features of familiar models
• Exactly solvable models in 2D semiclassical dilaton gravity and extremal black holes

Cited by in corpus (5)

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• Two critical phenomena in the exactly soluble quantized Schwarzschild black hole
• Local thermodynamics of KS black hole
• Hawking-Page phase transition of the Schwarzschild AdS black hole with the effective Tolman temperature
• Near-extremal and extremal quantum-corrected two-dimensional charged black holes