Classical and Quantum Shell Dynamics, and Vacuum Decay

Details Classical and Quantum Shell Dynamics, and Vacuum Decay Classical and Quantum Shell Dynamics, and Vacuum Decay

1997-06-27

arxiv.org/abs/gr-qc/9706081v1

Class.Quant.Grav. 14 (1997) 2727-2755

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

36 pages, ReVTeX, 10 Figs. in postscript format, in print on Class.& Quant.Grav

Scientific paper

10.1088/0264-9381/14/10/004

Following a minisuperspace approach to the dynamics of a spherically symmetric shell, a reduced Lagrangian for the radial degree of freedom is derived directly from the Einstein-Hilbert action. The key feature of this new Lagrangian is its invariance under time reparametrization. Indeed, all classical and quantum dynamics is encoded in the Hamiltonian constraint that follows from that invariance. Thus, at the classical level, we show that the Hamiltonian constraint reproduces, in a simple gauge, Israel's matching condition which governs the evolution of the shell. In the quantum case, the vanishing of the Hamiltonian (in a weak sense), is interpreted as the Wheeler-DeWitt equation for the physical states, in analogy to the corresponding case in quantum cosmology. Using this equation, quantum tunneling through the classical barrier is then investigated in the WKB approximation, and the connection to vacuum decay is elucidated.

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