Effective Action and Thermodynamics of Radiating Shells in General Relativity

Details Effective Action and Thermodynamics of Radiating Shells in General Relativity Effective Action and Thermodynamics of Radiating Shells in General Relativity

1999-09-06

arxiv.org/abs/gr-qc/9909018v1

Phys.Rev.D60:124018,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LATeX, 20 pages, 2 Figs

Scientific paper

10.1103/PhysRevD.60.124018

An effective action is obtained for the area and mass aspect of a thin shell of radiating self-gravitating matter. On following a mini-superspace approach, the geometry of the embedding space-time is not dynamical but fixed to be either Minkowski or Schwarzschild inside the shell and Vaidya in the external space filled with radiation. The Euler-Lagrange equations of motion are discussed and shown to entail the expected invariance of the effective Lagrangian under time-reparametrization. They are equivalent to the usual junction equations and suggest a macroscopic quasi-static thermodynamic description.

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