RELAXATION AND 1 F NOISE IN PHONON SYSTEMS

This paper examines the relationships that exist between low-frequency fluctuations of the rate of dissipation in nonequilibrium thermodynam ic systems and higher-order multitime statistical moments of equilibri um noise. In particular, it studies the relationships between internal friction fluctuations in the phonon system being excited and low-freq uency fluctuations of Raman scattering of light in an equilibrium phon on system. We show that both processes are related to strong fluctuati ons in the phase diffusion rate and the relaxation of phonon modes gen erated, in turn, by the exponential instability of the dynamical paths of the system. (C) 1997 American Institute of Physics.