In this paper we shall study the problem of quantum friction in the Wigner representation. For quadratic Hamiltonians the Wigner equation coincides with the classical Liouville equation although there are distribution functions which depend on the Planck constant. For these distributions the...

For suitable states of the Dicke maser model we study the time evolution of the mean photon number n(t) in the limit N → ∞. Here N is the number of maser active atoms. Our starting point is a well-tuned cavity with only one mode of the radiation field excited. Introducing new dynamical...

We present a detailed experimental study of the viscosity of carbon dioxide as a function of density at a temperature near the critical temperature. Kinetic theory predicts the presence of a logarithmic term in the density expansion for the viscosity of gases. While it is difficult to prove the...

The solution of the Fokker-Planck equation with spatial coordinate-dependent moments is given in the form of the path integral, involving the conditional probability expressed in terms of the moments at the “postpoint”. It is easily seen that it satisfies the Fokker-Planck equation.

Mixtures displaying gas-gas equilibria of the second kind are discussed on the basis of the geometry of the coexistence surface. If one approaches the critical double point isothermally the values of the critical exponents α, β, γ and ν are twice their “usual” values, whereas δ and η...

We present the low-temperature method for the Ising model in the transverse field based on the approximate boson expression for Pauli-operators. Kinematic effects, which arise through special decoupling of Green's functions, lead to appearance of additional energy levels.

A formal analogy between the linear Chapman-Enskog procedure and a variant of the perturbation theory of degenerate levels, as presented by C. Bloch, is established. The analogy is than exploited to obtain closed expressions for the Chapman-Enskog special solutions to all orders in the...

The integrated probability distribution functions of the effective field νi(h) on the site i satisfy a recurrence formula for the random Ising model on the linear chain or on the Cayley tree. Assuming that the values of the exchange integral are bounded, we prove for the system on the linear...

The (discrete-time) Glauber model is considered for a one-dimensional system of spins sj = ±1 with nearest-neighbor Ising interaction H = -ΣjJjsjsj+1. The Jj = ±J are treated as random variables with an arbitrary joint probability p(J). The exact time-dependent average 〈sj〉t is...

For stable systems the heat conduction due to the charge carriers in a weakly ionized plasma of electrons, ions and neutral atoms is studied in the presence of a strong external magnetic field. A kinetic theory description is given in terms of transport-relaxation equations derived from the...