Derivation of the fluctuation-dissipation theorem from unitarity
classification
✦ hep-th
cond-mat.stat-mechmath-phmath.MP
keywords
derivationfluctuation-dissipationtheoremunitarityclosedfieldformalismgive
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Using the closed time path formalism in thermal field theory, we give a derivation of the fluctuation-dissipation theorem which is based on the unitarity of the $S$-matrix.
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