We study a method proposed recently that gives a unified view of the properties of stochastic fields determined by Langevin-type equations. The functional integrals involved are shown to need an additional prescription to be defined, this prescription being related to the relative order of...

The long wavelength modes of a system of two kinds of particles are studied starting from first principles while accounting for the presence of Coulomb interactions. It is shown that in order to cope with the Coulomb singularity the use of two-fluid hydrodynamical variables is indicated....

It is shown that the three-particle kinetic operator for inhomogeneous gases obtained using Prigogine's method and the matrix representation of the Liouville equation introduced by Balescu is equivalent to the corresponding expression derived by Choh and Uhlenbeck using Bogolubov's method. Both...

Spin wave theory is considered for dipolar crystals with a demagnetized ferromagnetic state as the ground state. According to the anisotropy of the g-tensor the dispersion relations for the spin-wave energies are different. The temperature dependence of the specific heat and the spontaneous...

We present the exact solution of the linear Boltzmann equation for one-dimensional hard rods. In particular, we compute the velocity correlation function and the Van Hove self-correlation function.

The concentration dependences of the binary diffusion coefficients of the systems He-Ar and He-O2 are reported at 300 K and 1 atm pressure. Two independent sets of data, obtained with a two-bulb cell and a shearing-cell of Loschmidt design, agree within the error of measurement. The data for the...

A model, suggested by Dhar, of a lattice gas whose states are partial orders is examined. By counting partial orders, the entropy is computed for a certain energy range. The system is shown to have a phase transition within that range. The nature of the states involved are discussed.

The diffusion coefficient for a relativistic Lorentz gas of hard spheres is calculated with the help of two different methods. Numerical results are given for a wide range of temperatures.

The asymptotic behaviour of self-avoiding walks that do not lie on a lattice has been investigated by a Monte-Carlo procedure. Its dependence on the fine structure of the walk is discussed.