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|Vacuum decay in quantum field theory
|Calzetta, Esteban A., 1958-
Roura Crumols, Albert
Verdaguer Oms, Enric, 1950-
|Teoria quàntica de camps
Quantum field theory
Open systems (Physics)
|The American Physical Society
|We study the contribution to vacuum decay in field theory due to the interaction between the long- and short-wavelength modes of the field. The field model considered consists of a scalar field of mass M with a cubic term in the potential. The dynamics of the long-wavelength modes becomes diffusive in this interaction. The diffusive behavior is described by the reduced Wigner function that characterizes the state of the long-wavelength modes. This function is obtained from the whole Wigner function by integration of the degrees of freedom of the short-wavelength modes. The dynamical equation for the reduced Wigner function becomes a kind of Fokker-Planck equation which is solved with suitable boundary conditions enforcing an initial metastable vacuum state trapped in the potential well. As a result a finite activation rate is found, even at zero temperature, for the formation of true vacuum bubbles of size M-1. This effect makes a substantial contribution to the total decay rate.
|Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.64.105008
|It is part of:
|Physical Review D, 2001, vol. 64, núm. 10, p. 105008-1-105008-21
|Appears in Collections:
|Articles publicats en revistes (Física de la Matèria Condensada)
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