QUANTUM DISSIPATION AND QUANTUM NOISE
Y. N. Srivastava, G. Vitiello, A. Widom
Abstract
We derive the exact action for a damped mechanical system ( and the special case of the linear oscillator) from the path integral formulation of the quantum Brownian motion problem developed by Schwinger and by Feynman and Vernon. The doubling of the phase-space degrees of freedom for dissipative systems and thermal field theories is discussed and the initial values of the doubled variables are related to quantum noise effects.
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