The influence of a magnetic field on the transport properties of binary mixtures of a polyatomic and a noble gas is studied theoretically. Using an inverse operator technique, first thermal conductivity and viscosity are treated. Then diffusion and thermal diffusion are discussed in detail, with...

In this paper, a study of the connected subgroups of the Poincaré group which can be seen as invariance groups of electromagnetic fields (they will be called CEPS) and of their corresponding invariant fields is reported.

The superfluid perturbation theory is used to generalize Luttinger's theorem in the normal Fermi system for superconductors. It is shown that the imaginary part of the diagonal element of the self-energy matrix is not a smooth function of the energy but has sudden jumps characteristic of the...

On the grounds of modern continuum mechanics this work proposes a generalization of the spin-lattice relaxation of Gilbert to the case of anisotropic deformable ferromagnets, along with the associated viscous processes. Various approximations are obtained, among which one results, for very small...

A recently proposed method to treat open systems is applied to the evaluation of multitime correlation functions of operators of the open system itself. A general quantum-mechanical regression theorem is deduced, which holds also when the open system undergoes a non- markoffian motion. Such...

Classical ensemble theory is compared to quantum mechanics. The remarkable feature is that classical ensemble theory, when suitably generalized, leads, for a system of one degree of freedom to two independent uncertainty relations. On the contrary classical trajectory theory which deals only...

The Fokker-Planck equation in one dimension has been solved for a system in a periodic potential and linearly perturbed by a time- and space- varying external electric field. The solution is not exact, but we believe it is less approximate than any attempted previously on this problem. We have...

The energy levels of an impurity atom in a thin slab of crystal are calculated by the method of equivalent Hamiltonian, which includes potential barriers representing the surfaces. For slab thickness smaller than the Bohr radius of the impurity atom, the atom is found to behave like a two...

A system consisting of a quantum harmonic oscillator interacting with massless independent modes is considered. We obtain the long time limit of the correlation functions between the oscillator and any field mode, and between two field modes. Explicit expressions are given for the corresponding...

The kinetic equation for the dilute Lorentz gas of particles with repulsive-attractive potential, is derived. For that purpose the distribution function is decomposed into two parts: the one corresponding to the bounded motion of the marked particle and the second corresponding to its unbounded...