Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12320
Title: Vacuum decay in quantum field theory
Author: Calzetta, Esteban A., 1958-
Roura, Albert
Verdaguer Oms, Enric, 1950-
Keywords: Teoria quàntica de camps
Buit
Efecte túnel
Sistemes oberts
Quantum field theory
Vacuum
Tunneling (Physics)
Open systems (Physics)
Issue Date: 2001
Publisher: The American Physical Society
Abstract: 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.
Note: 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
URI: http://hdl.handle.net/2445/12320
ISSN: 0556-2821
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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