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Nonequilibrium dynamics: a renormalized computation scheme
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We present a regularized and renormalized version of the one-loop nonlinear relaxation equations that determine the non-equilibrium time evolution of a classical (constant) field coupled to its quantum fluctuations. We obtain a computational method in which the evaluation of divergent fluctuation integrals and the evaluation of the exact finite parts are cleanly separated so as to allow for a wide freedom in the choice of regularization and renormalization schemes. We use dimensional regularization here. Within the same formalism we analyze also the regularization and renormalization of the energy-momentum tensor. The energy density serves to monitor the reliability of our numerical computation. The method is applied to the simple case of a scalar phi^4 theory; the results are similar to the ones found previously by other groups.
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Coherence and Quantum Stability of Relativistic Superfluid States
A charged scalar condensate is quantum-stable to all perturbative orders when it is described by the interacting vacuum of fluctuations, a non-Gaussian dressed coherent state that is an eigenstate of H minus mu Q.
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