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 thermodynamic systems and higher-order multitime statistical moments of equilibrium noise. In particular, it studies the relationships between internal friction fluctuations in the phonon system being excited and low-frequency fluctuations of Raman scattering of light in an equilibrium phonon system. We show that both processes are related to strong fluctuations in the phase diffusion rate and the relaxation of phonon modes generated, in turn, by the exponential instability of the dynamical paths of the system. Zh. éksp. Teor. Fiz. 111, 2086–2098 (June 1997)