Landau's description of the excitations in a macroscopic system in terms of quasiparticles
stands out as one of the highlights in quantum physics. It provides an accurate description of …

The properties of an impurity immersed in a dilute D-dimensional Bose gas at temperatures
close to its second-order phase transition point are considered. Particularly by means of the …

The role of repulsive interactions in statistical systems of Bose particles is investigated.
Three different phenomenological frameworks are considered: a mean-field model, an …

We discuss Bragg scattering on both Bose and Fermi gases with strong short-range
interactions in the deep inelastic regime of large wave vector transfer q, where the dynamic …

We solve the Gross-Pitaevskii (GP) and Bogoliubov equations to investigate the
metastability of superfluidity in a Bose-Einstein condensate in the presence of a uniformly …

We show that the critical velocity of a superfluid flow through a penetrable barrier coincides
with the onset of the analog black-hole lasing effect. This dynamical instability is triggered by …

A two-parameter fractional statistics is proposed, which can be used to model a weakly
interacting Bose system. It is shown that the parameters of the introduced weakly …

We study the statistical properties of a gas of interacting bosons trapped in a box potential in
two and three dimensions. Our primary focus is the characteristic temperature $\tchar $, ie …

Equation of state and electric (isospin) charge fluctuations are studied for matter composed
of interacting pions. The pion matter is described by self interacting scalar fields via a ϕ 4-ϕ …

A system of bosons studied within the mean-field framework has two fascinating
phenomena: a liquid-gas first order phase transition and Bose-Einstein condensation …