80 citations · 223 across the 18 of their papers we have counts for
18 papers
Impurity self-energy in the strongly-correlated Bose systems
Galyna Panochko, Volodymyr Pastukhov, Ivan Vakarchuk
We proposed the non-perturbative scheme for calculation of the impurity spectrum in the Bose system at zero temperature. The method is based on the path-integral formulation and de…
Behavior of the impurity atom in a weakly-interacting Bose gas
G. Panochko, V. Pastukhov, I. Vakarchuk
We studied the properties of a single impurity atom immersed in a dilute Bose condensate at low temperatures. In particular, we perturbatively obtained the momentum dependence of t…
Internal energy of many-boson system with three- and four-particle direct correlations taken into account
Ivan Vakarchuk, Orest Hryhorchak
In this paper we calculate kinetic, potential and full energy with three- and four-particle direct correlations taken into account at wide temperature region on the base of the den…
Structure functions of many-boson system with regard for direct three- and four-particle correlations
Ivan Vakarchuk, Orest Hryhorchak
On the basis of the expression for the density matrix of interacting Bose particles in the coordinate representation with regard for the direct three- and four-particle correlation…
Effective mass of He atom in superfluid and normal phases
Ivan Vakarchuk, Orest Hryhorchak, Volodymyr Pastukhov +1
The formula for the temperature dependence of the effective mass of a He atom in the superfluid and normal phases is obtained.\,\,This expression for the effective mass all…
Theory of a many-boson system with deformed Heisenberg algebra
I. O. Vakarchuk, G. I. Panochko
We propose to consider nonlinear fluctuations in the theory of liquid He deforming the commutation relations between the generalized coordinates and momenta. Generalized coor…