arXiv subjects

Bohdan Lev

Publications and source records attributed to Bohdan Lev.

6 recordsLinked to original sources

arXiv2025

Light-induced Non-uniform Surface Polarization Evolution as Active Matter Motion Mechanism

A new mechanism for micro-swimmer motion in an aquatic environment, which implies light-induced polarization perturbations as a motivation for its motion, is proposed. The mechanism assumes that natural light leads to an enhancement of the non-uniform polarization distribution at the micro-swimmer's surface and also to an enhancement of its surface deformations. The interaction of such non-uniform polarization with free charges of the environment and the mechanical interaction of surface deformations with media flows lead to the directed micro-swimmer motion. The mathematical justification for this mechanism is based on the free energy functional minimization in terms of polarization. The obtained solutions correspond to the translation motion along the micro-swimmer and the rotation of the non-uniform polarization distribution. The estimation of the velocity of micro-swimmer motion, which is based on the hydrodynamics of the active matter, corresponds to the experimentally observed values.

cond-mat.soft↗

arXiv2008

"Equilibrium" states of non equilibrium system

A possible approach to description of the non equilibrium system has been proposed. Based on the Fokker-Plank equation in term of energy for non equilibrium distribution function of macroscopical system was obtained the stationary solution which can be interpreted as the equilibrium distribution function for new energetic state. The proposed approach takes into account the possible motion between different states of system, induced by dissipation of energy and influence of environment which dependence on energy of the system. A non-linear model, which describe possible stationary state of system with different processes in it, has been described.

cond-mat.stat-mech↗

arXiv2008

Cellular structure in system of interacting particles

The general description of formation the cellular structure in the system of interacting particles is proposed. Interactions between particles are presumably well-understood and the phase transition in which can be studied in the scale of particle resolution. We presented analytical results of possible cellular structures for suspension of colloidal particles, in system particles immersed in liquid crystal and gravitational system. We have shown that cellular structure formation can occur in system of interacting particles for realistic values of temperature and particles concentration.

cond-mat.stat-mech↗

arXiv2008

Nonlinear model of source of a elastic field

A general description of the long-range elastic interaction is proposed. The far-field type of the interaction is determined by the way of symmetry breaking of the distribution of the elastic field produced by the topological defect as isolated inclusions. Every topological defect can be present as the source of the elastic field and can be described in the terms of this field. At the short distance the source can be described as nonlinear object which present charge of linear theory of elastic field at the far distance. In this article the nonlinear models of source of a elastic field was proposed.

physics.class-ph↗

arXiv2006

To the concept of the elastic interaction

A general description of elastic matter and the long-range elastic interaction is propose. The type of the far-field interaction is determined by the way of breaking in the continuum distribution of the elastic field produced by topological defects, which can present isolated inclusions. To provide an adequate description of the inter-inclusion interaction. Thus we can determine the size of inclusion as core topological defect in elastic field. In this description the charge in electrodynamic and mass in gravity present peculiarity of elastic filed and determined in term this field. The interaction is a direct and immediate result of the field deformation. Exist two type interaction. Interaction through change the ground state of elastic matter and interaction with the help of the carrier of interaction, which can present as small changing of deformations.

cond-mat.soft↗

arXiv2003

System of particles with interaction and the cluster formation in condensed matter

We investigate the behaviour of a system of particles with the different character of interaction. The approach makes it possible to describe systems of interacting particles by statistical methods taking into account a spatial nonhomogeneous distribution of particles, i.e. cluster formation. For these clusters are evaluated: their size, the number of particles in a cluster, and the temperature of phase transition to the cluster state. Three systems are under consideration: electrons on the liquid helium surface, particles interacting by the shielding Coulomb potential, which are found under the influence of an elastic field (e.g. nucleons in a nucleus), and gravitating masses with the Hubble expansion.

cond-mat↗