Out of Equilibrium Non-perturbative Quantum Field Dynamics in Homogeneous External Fields

Details Out of Equilibrium Non-perturbative Quantum Field Dynamics in Homogeneous External Fields Out of Equilibrium Non-perturbative Quantum Field Dynamics in Homogeneous External Fields

2001-09-27

arxiv.org/abs/hep-ph/0109261v2

Phys.Rev. D65 (2002) 045012

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 30 pages, 12 .ps figures, improved version to appear in Phys Rev D

Scientific paper

10.1103/PhysRevD.65.045012

The quantum dynamics of the symmetry broken lambda (Phi^2)^2 scalar field theory in the presence of an homogeneous external field is investigated in the large N limit. We choose as initial state the ground state for a constant external field J .The sign of the external field is suddenly flipped from J to - J at a given time and the subsequent quantum dynamics calculated. Spinodal instabilities and parametric resonances produce large quantum fluctuations in the field components transverse to the external field. This allows the order parameter to turn around the maximum of the potential for intermediate times. Subsequently, the order parameter starts to oscillate near the global minimum for external field - J, entering a novel quasi-periodic regime.

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