TY  - JOUR
A1  - Anchishkin, Dmitry
A1  - Gnatovskyy, Volodymyr
A1  - Zhuravel, Denys
A1  - Karpenko, Vladyslav
A1  - Mishustin, Igor N.
A1  - Stöcker, Horst
T1  - Phase transitions in the interacting relativistic boson systems
T2  - Universe
N2  - The thermodynamic properties of the interacting particle–antiparticle boson system at high temperatures and densities were investigated within the framework of scalar and thermodynamic mean-field models. We assume isospin (charge) density conservation in the system. The equations of state and thermodynamic functions are determined after solving the self-consistent equations. We study the relationship between attractive and repulsive forces in the system and the influence of these interactions on the thermodynamic properties of the bosonic system, especially on the development of the Bose–Einstein condensate. It is shown that under “weak” attraction, the boson system has a phase transition of the second order, which occurs every time the dependence of the particle density crosses the critical curve or even touches it. It was found that with a “strong” attractive interaction, the system forms a Bose condensate during a phase transition of the first order, and, despite the finite value of the isospin density, these condensate states are characterized by a zero chemical potential. That is, such condensate states cannot be described by the grand canonical ensemble since the chemical potential is involved in the conditions of condensate formation, so it cannot be a free variable when the system is in the condensate phase.
KW  - relativistic boson system of particles and antiparticles
KW  - Bose–Einstein condensation
Y1  - 2023
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/86348
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-863485
SN  - 2218-1997
VL  - 9.2023
IS  - 9, 411
PB  - MDPI
CY  - Basel
ER  -