The exact analytic expression for the polaron mass operator in the second order of the coupling constant is established for the first time. It holds in the whole energy scale. The peculiarities of the mass operator are ...

Relativistic spin particles are approached from the stand point of Hamiltonian actions of Poincare group on itself. The several possible solutions are classified and realizations are given in terms of Dirac’s constraints ...

In the present paper we suggest a possible mechanism of repolarization of a short hydrogen bonded chain. This mechanism is based on the coherent tunnel reorientation of ionic groups and is additional to the other one ...

This paper discusses a phenomenological model used to describe various properties of a dx²−y² superconductor in its temperature as well as frequency dependence, namely, the London penetration depth, the optical conductivity, ...

The concept of generalized collective modes, recently proposed for the investigation of simple fluids, is now applied to describe processes of dielectric relaxation in dipolar systems. The approach presented here is ...

Experimental and theoretical studies of the ferroelastic domain structure of the (NH₄)₃H(SeO₄)₂ crystal in phases III and IV are performed. Using the refined structural data the orientations of W - and W′-type domain ...

The aim of this review article is to present recent advances in the generalized hydrodynamics of dense gases and liquids. The presentation attempts to integrate the results known previously with the perspective of ...

The theory of superconducting pairing due to the exchange and kinematical interactions in the t - J model in a paramagnetic state is developed. The Dyson equation for the matrix Green functions in terms of the ...

The system of bose liquid + impurity is considered. The energy spectrum, as well as effective mass of impurity is calculated. For the case of an ³He atom in superfluid <⁴He numerical calculations are performed.

The Lagrangian relativistic direct interaction theory in the various forms of dynamics is formulated and its connections with the Fokker-type action theory and with the constrained Hamiltonian mechanics are established. The ...