Calzetta, Esteban A., 1958-Roura Crumols, AlbertVerdaguer Oms, Enric, 1950-2010-06-252010-06-2520020031-9007https://hdl.handle.net/2445/13192We study the process of vacuum decay in quantum field theory focusing on the stochastic aspects of the interaction between long- and short-wavelength modes. This interaction results in a diffusive behavior of the reduced Wigner function describing the state of long-wavelength modes, and thereby to a finite activation rate even at zero temperature. This effect can make a substantial contribution to the total decay rate.4 p.application/pdfeng(c) American Physical Society, 2002Teoria quàntica de campsBuitEfecte túnelSistemes obertsQuantum field theoryVacuumTunneling (Physics)Open systems (Physics)info:eu-repo/semantics/article193280info:eu-repo/semantics/openAccess