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Using functional techniques (the closed-time-path formalism) we derive a systematic way of computing the dynamical operator for the fluctuations of the mean value around a stable configuration. The equations are real and causal and contain some dissipative terms. We examine the effects predicted by them for a λ Φ 4 theory in the one- and two-loop approximations. We estimate the time needed for the damping of the oscillations around a zero and a nonzero mean value (the dominant processes are different in these two cases). We discuss some conceptual issues about the nature of this dissipative process.
Physical Review D – American Physical Society (APS)
Published: Jul 15, 1990
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