Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-03-06
Phys.Rev. D56 (1997) 1156-1169
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, RevTeX, 9 PostScript figures included
Scientific paper
10.1103/PhysRevD.56.1156
The semiclassical formalism for numerical calculation of the rate of tunneling transitions induced by N particles with total energy E of order or higher than the height of the barrier is developed. The formalism is applied to the induced false vacuum decay in the massive four-dimensional $-\lambda\phi^4$ model. The decay rate, as a function of E and N, is calculated numerically in the range $0.4\lsim E/E_{sph}\lsim 3.5$ and $0.25 \lsim N/N_{sph}\lsim 1.0$, where $E_{sph}$ and $N_{sph}$ are the energy and the number of particles in the analog of the sphaleron configuration. The results imply that the ``two-particle'' cross section of the false vacuum decay is exponentially suppressed at least up to energies of order $10 E_{sph}$. At $E\sim E_{sph}$, this exponential suppression is estimated as about 80% of the zero energy suppression.
Kuznetsov A. N.
Tinyakov Peter G.
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