189 citations · 478 across the 24 of their papers we have counts for
18 papers · 1 filter
Spinodal enhancement of fluctuations in nucleus-nucleus collisions
Roman Poberezhnyuk, Oleh Savchuk, Volodymyr Vovchenko +4
Subensemble Acceptance Method (SAM) [1,2] is an essential link between measured event-by-event fluctuations and their grand canonical theoretical predictions such as lattice QCD. T…
Pion stars embedded in neutrino clouds
O. S. Stashko, O. V. Savchuk, L. M. Satarov +3
We study self-gravitating multi-pion systems (pion stars) in a state of the Bose condensate. To ensure stability of such stars, it is assumed that they are immersed in the lepton b…
Molecular dynamics analysis of particle number fluctuations in the mixed phase of a first-order phase transition
Volodymyr A. Kuznietsov, Oleh Savchuk, Roman V. Poberezhnyuk +3
Molecular dynamics simulations are performed for a finite non-relativistic system of particles with Lennard-Jones potential. We study the effect of liquid-gas mixed phase on partic…
Phase transition amplification of proton number fluctuations in nuclear collisions from a transport model approach
O. Savchuk, R. V. Poberezhnyuk, A. Motornenko +3
The time evolution of particle number fluctuations in nuclear collisions at intermediate energies ( GeV) is studied by means of the UrQMD-3.5 transport mode…
Fluctuations in heavy ion collisions and global conservation effects
Roman V. Poberezhnyuk, Volodymyr Vovchenko, Oleh Savchuk +3
Subensemble is a type of statistical ensemble which is the generalization of grand canonical and canonical ensembles. The subensemble acceptance method (SAM) provides general formu…
Possible origin of HADES data on proton number fluctuations in Au+Au collisions
O. Savchuk, R. V. Poberezhnyuk, M. I. Gorenstein
Recent data of the HADES Collaboration in Au+Au central collisions at GeV indicate large proton number fluctuations inside one unit of rapidity around midra…
Critical point influenced by Bose-Einstein condensation
V. A. Kuznietsov, O. Savchuk, O. S. Stashko +1
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. Interplay betwee…
Critical point particle number fluctuations from molecular dynamics
Volodymyr A. Kuznietsov, Oleh Savchuk, Mark I. Gorenstein +2
We study fluctuations of particle number in the presence of critical point by utilizing molecular dynamics simulations of the classical Lennard-Jones fluid in a periodic box. The n…
Critical point and Bose-Einstein condensation in pion matter
V. A. Kuznietsov, O. S. Stashko, O. V. Savchuk +1
The Bose-Einstein condensation and the liquid-gas first order phase transition are studied in the interacting pion matter. Two phenomenological models are used: the mean-field mode…
Constraining baryon annihilation in the hadronic phase of heavy-ion collisions via event-by-event fluctuations
Oleh Savchuk, Volodymyr Vovchenko, Volker Koch +2
We point out that the variance of net-baryon distribution normalized by the Skellam distribution baseline, , is sensitive to the possible m…
Phase diagram of interacting pion matter and isospin charge fluctuations
O. S. Stashko, O. V. Savchuk, R. V. Poberezhnyuk +2
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 vi…
Higher order conserved charge fluctuations inside the mixed phase
Roman V. Poberezhnyuk, Oleh Savchuk, Mark I. Gorenstein +2
General formulas are presented for higher order cumulants of the conserved charge statistical fluctuations inside the mixed phase. As a particular example the van der Waals model i…
Thermodynamic properties of interacting bosons with zero chemical potential
O. S. Stashko, D. V. Anchishkin, O. V. Savchuk +1
Thermodynamics properties of an interacting system of bosons are considered at finite temperatures and zero chemical potential within the Skyrme-like mean-field model. An interplay…
Bose-Einstein condensation phenomenology in systems with repulsive interactions
Oleh Savchuk, Yehor Bondar, Oleksandr Stashko +4
The role of repulsive interactions in statistical systems of Bose particles is investigated. Three different phenomenological frameworks are considered: a mean field model, an excl…
Critical point fluctuations: Finite size and global charge conservation effects
Roman V. Poberezhnyuk, Oleh Savchuk, Mark I. Gorenstein +6
We investigate simultaneous effects of finite system size and global charge conservation on thermal fluctuations in the vicinity of a critical point. For that we consider a finite…
Connecting fluctuation measurements in heavy-ion collisions with the grand-canonical susceptibilities
Volodymyr Vovchenko, Oleh Savchuk, Roman V. Poberezhnyuk +2
We derive the relation between cumulants of a conserved charge measured in a subvolume of a thermal system and the corresponding grand-canonical susceptibilities, taking into accou…
Binomial acceptance corrections for particle number distributions in high-energy reactions
Oleh Savchuk, Roman V. Poberezhnyuk, Volodymyr Vovchenko +1
The binomial acceptance correction procedure is studied for particle number distributions detected in high energy reactions in finite regions of the momentum space. We present acce…
Traces of the nuclear liquid-gas phase transition in the analytic properties of hot QCD
Oleh Savchuk, Volodymyr Vovchenko, Roman V. Poberezhnyuk +2
The nuclear liquid-gas transition at normal nuclear densities, fm, and small temperatures, MeV, has a large influence on analytic properties…