Properties of two-level tunneling system which interacts with lattice vibrations are discussed in the framework of the polaron theory and the phase space approach. The decrease of the dynamic distortion of the lattice with increasing ratio η of the rigid-lattice tunneling matrix element to the...

The behaviour of the transport coefficients of a Van der Waals fluid is studied in the one-phase region along the critical isochore of the liquid-vapour phase transition. When ϵ=(T−Tc)Tc→0 the strongest singularity is found in the case of the bulk viscosity (−ϵ−2). The divergence of...

The general method of construction of exact master equations (MEqs) of required form: non-markovian, time-convolutionless, with partial memory, etc. is presented. The method is based on the transformation of the Liouville-von Neumann equation (LEq) by properly constructed superoperators K and...

Kinetic equations for the one-particle spin density matrix for a system of magnetic molecules in a liquid interacting with one another through intermolecular spin-spin forces are derived under the following assumptions: a) “internal” relaxation processes are ignored: b) at t = 0 the entire...

Variational expressions for the transport coefficients of a one-component, relativistic gas are derived from the linearized relativistic Boltzmann equation for both quantum and classical gases. These expressions depend on functions χ of the energy of the particles comprising the gas in such a...

New data of the thermal diffusion factor, αT, for five NeKr and four ArKr mixtures in the low temperature range are given. It is shown that the dependence of αT on the composition of these mixtures together with the thermodynamic and first-order transport properties of the noble gases...

The attention will be focussed on a generalized Wiener diffusion process for which the macroscopic evolution ẙ = c1(y) equals zero, of course, and where the variance of the process obeys g̊s2 = c2(y). The diffusion function c2(y) may be state dependent in an arbitrary way. We invoke our...

On the basis of our experimental data for the isotropic thermal diffusion factor and the more recent data for the transport phenomena and the second virial of pressure, we propose for neon the new set of parameters α = 15.5, ϵ/k = 46.6±0.9 K and rm = 3.030 Å for the exponential-six...

A statistical mechanical explanation of the freezing transition which is exact in a certain limit, is worked out.

The order-parameter correlation function Ĝ(q, ξ1) is calculated in the critical region of momentum space q in terms of a second-moment correlation length ξ1 by means of perturbation expansion to order 1/n, for an n-vector system with short-range interactions, in zero field above Tc, for 2 d...