Výsledky vyhľadávania
Názov Charge and isospin fluctuations in a non-ideal pion gas with dynamically fixed particle number Aut.údaje Evgeni E. Kolomeitsev ... [et al.] Autor Kolomeitsev Evgeni E. 1970- (34%) UMBFP06 - Katedra fyziky
Spoluautori Voskresensky Dmitri (33%)
Borisov Maxim E. (33%)
Zdroj.dok. The European Physical Journal A : Hadrons and Nuclei. Vol. 57, no. 4 (2021), pp. [1-29]. - Berlin : Springer, 2021 Kľúč.slová Bose-Einsteinova kondenzácia - Bose-Einstein condensation heavy ion collisions Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Nemecko Kategória publikačnej činnosti ADC Číslo archívnej kópie 49947 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika 
článok
Názov Hybrid model with viscous relativistic hydrodynamics: a role of constraints on the shear-stress tensor Aut.údaje A. S. Khvorostukhin ... [et al.] Autor Khvorostukhin A. S. (34%)
Spoluautori Kolomeitsev Evgeni E. 1970- (33%) UMBFP06 - Katedra fyziky
Toneev V. D. (33%)
Zdroj.dok. The European Physical Journal A : Hadrons and Nuclei. Vol. 57, no. 10 (2021), pp. 294-1-294-25. - New York : Springer Nature, 2021 Kľúč.slová relativistic hydrodynamics heavy ion collisions viscosity Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Nemecko Anotácia We present the hybrid model connecting the parton–hadron–string dynamic model (PHSD) and a hydrodynamic model taking into account shear viscosity within the Israel–Stewart approach. The numerical scheme, initialization, and particlization procedure are discussed in detail. The performance of the code is tested on the pion and proton rapidity and transverse mass distributions calculated for Au + Au and Pb+Pb collisions at AGS–SPS energies. The influence of the switch time from transport to hydro models, the viscous parameter, and freeze-out time are discussed. Since the applicability of the Israel–Stewart hydrodynamics assumes the perturbative character of the viscous stress tensor, πμν, which should not exceed the ideal energy–momentum tensor, T μν id , hydrodynamical codes usually rescale the shear stress tensor if the inequality πμν T μν id is not fulfilled in some sense. There are several conditions used in the literature and we analyze in detail the influence of different conditions and values of the cut-off parameter on observables.We show that the form of the corresponding condition plays an important role in the sensitivity of hydrodynamic calculations to the viscous parameter – a ratio of the shear viscosity to the entropy density, η/s. It is shown that the constraints used in the vHLLE and MUSIC models give the same results for the observables.With these constraints, the rapidity distributions and transverse momentum spectra are most sensitive to a change of the η/s ratio. We demonstrate that these constraints do not guarantee that each element of the πμν tensor is smaller than the corresponding element T μν id . As an alternative, a strict condition is used. When applied it reduces the sensitivity of the proton and pion momentum distributions to the viscosity parameter. We performed global fits of the rapidity and transverse mass distributions of pion and protons. It was also found that η/s as a function of the collision energy monotonically increases from Elab = 6 AGeV up to Elab = 40 AGeV and saturates for higher SPS energies. We observe that it is difficult to reproduce simultaneously pion and proton rapidity distribution within our model with the present choice of the equation of state without a phase transition. URL Link na plný text Link do databázy WoS Kategória publikačnej činnosti ADC Číslo archívnej kópie 50708 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika článok
Názov Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations Aut.údaje Gabriele Inghirami, Paula Hillmann ... [et al.] Autor Inghirami Gabriele (25%)
Spoluautori Hillmann Paula (25%)
Tomášik Boris 1972- (25%) UMBFP06 - Katedra fyziky
Bleicher Marcus (25%)
Zdroj.dok. Journal of Physics G: Nuclear and Particle Physics. Vol. 47, no. 2 (2020), art. no. 025104, pp. [1-16]. - Bristol : IOP Publishing, 2020 Kľúč.slová ultrarelativistic heavy ion collisions freeze-out doprava - transportation - transport Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Veľká Británia Kategória publikačnej činnosti ADC Číslo archívnej kópie 47346 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika 
nerozpoznaný
Názov Vorticity and hyperon polarization at energies available at JINR Nuclotron-based Ion Collider fAcility Aut.údaje E. E. Kolomeitsev, V. D. Toneev ... [et al.] Autor Kolomeitsev Evgeni E. 1970- (34%) UMBFP06 - Katedra fyziky
Spoluautori Toneev V. D. (33%)
Voronyuk Vadym (33%)
Zdroj.dok. Physical Review C. Vol. 97, no. 6 (2018), pp. [1-9]. - Maryland : American Physical Society, 2018 Kľúč.slová heavy ion collisions vorticity hyperon polarization Jazyk dok. angličtina Krajina Spojené štáty Systematika 53 Anotácia We study the formation of fluid vorticity and the hyperon polarization in heavy-ion collisions at energies available at the JINR Nuclotron-based Ion Collider fAcility in the framework of the parton-hadron-string dynamic model, taking into account both hadronic and quark-gluonic (partonic) degrees of freedom. The vorticity properties in peripheral Au+Au collisions at √sNN= 7.7 GeV are demonstrated and confronted with other models. The obtained result for the Lambda polarization is in agreement with the experimental data by the STAR Collaboration, whereas the model is not able to explain the observed high values of the antihyperon anti-Lambda polarization URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 43912 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov Fluctuations in non-ideal pion gas with dynamically fixed particle number Aut.údaje E. E. Kolomeitsev, D. N. Voskresensky Autor Kolomeitsev Evgeni E. 1970- (50%) UMBFP06 - Katedra fyziky
Spoluautori Voskresensky Dmitri (50%)
Zdroj.dok. Nuclear Physics A. Vol. 973, (2018), pp. 89-103. - Amsterdam : Elsevier B.V., 2018 Kľúč.slová heavy ion collisions fluctuations Hartree approximation Bose-Einsteinova kondenzácia - Bose-Einstein condensation Jazyk dok. angličtina Krajina Holandsko Systematika 53 Anotácia We consider a non-ideal hot pion gas with the dynamically fixed number of particles in the model with the λφ4interaction. The effective Lagrangian for the description of such a system is obtained after dropping the terms responsible for the change of the total particle number. Reactions π+π−↔π0π0, which deter-mine the isospin balance of the medium, are permitted. Within the self-consistent Hartree approximation we compute the effective pion mass, thermodynamic characteristics of the system and the variance of the particle number at temperatures above the critical point of the induced Bose–Einstein condensation when the pion chemical potential reaches the value of the effective pion mass. We analyze conditions for the con-densate formation in the process of thermalization of an initially non-equilibrium pion gas. The normalized variance of the particle number increases with a temperature decrease but remains finite in the critical point of the Bose–Einstein condensation. This is due to the non-perturbative account of the interaction and is in contrast to the ideal-gas case. In the kinetic regime of the condensate formation the variance is shown to stay finite also URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 43902 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov Delta isobars in relativistic mean-field models with sigma-scaled hadron masses and couplings Aut.údaje E. E. Kolomeitsev, K. A. Maslov, D. N. Voskresensky Autor Kolomeitsev Evgeni E. 1970- (98%) UMBFP06 - Katedra fyziky
Spoluautori Maslov Konstantin A. (1%)
Voskresensky Dmitri (1%)
Zdroj.dok. Nuclear Physics A. Vol. 961 (2017), pp. 106-141. - Amsterdam : Elsevier B.V., 2017 Kľúč.slová neutron stars equation of state heavy ion collisions Jazyk dok. angličtina Krajina Holandsko Systematika 53 Anotácia We extend the relativistic mean-field models with hadron masses and meson-baryon coupling constants dependent on the scalar sigma field, studied previously to incorporate Delta(1232) baryons. Available empirical information is analyzed to put constraints on the couplings of Delta s with meson fields. Conditions for the appearance of Delta s are studied. We demonstrate that with inclusion of the Delta s our equations of state continue to fulfill majority of known empirical constraints including the pressure-density constraint from heavy-ion collisions, the constraint on the maximum mass of the neutron stars, the direct Urea and the gravitational baryon mass ratio constraints. (C) 2017 Elsevier B.V. All rights reserved. Kategória publikačnej činnosti ADC Číslo archívnej kópie 39909 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect Aut.údaje V. D. Toneev ... [et al.] Autor Toneev V. D. (1%)
Spoluautori Voronyuk Vadym (1%)
Kolomeitsev Evgeni E. 1970- (97%) UMBFP06 - Katedra fyziky
Cassing W. (1%)
Zdroj.dok. Physical Review C. Vol. 95, no. 3 (2017), pp. [1-6]. - Maryland : American Physical Society, 2017 Kľúč.slová heavy ion collisions energia - energy dense matter Jazyk dok. angličtina Krajina Spojené štáty Systematika 53 Anotácia It is proposed to identify a strong electric field-created during relativistic collisions of asymmetric nuclei-via the observation of pseudorapidity and transverse momentum distributions of hadrons with the same mass but opposite charge. The results of detailed calculations within the parton-hadron string dynamics (PHSD) approach for the charge-dependent directed flow v(1) are presented for semicentral Cu+Au collision at root S-NN = 200 GeV incorporating the inverse Landau-Pomeranchuk-Migdal (iLPM) effect, which accounts for a delay in the electromagnetic interaction with the charged degrees of freedom. By including the iLPM effect, we achieve a reasonable agreement of the PHSD results for the charge splitting in v(1)(p(T)) in line with the recent measurements by the STAR Collaboration for Cu+Au collisions at root s(NN) = 200 GeV while an instant appearance and coupling of electric charges at the hard collision vertex overestimates the splitting by about a factor of 10. We predict that the iLPM effect should practically disappear at energies of root s(NN) approximate to 9 GeV, which should lead to a significantly larger charge splitting of v1 at the future FAIR/NICA facilities. Kategória publikačnej činnosti ADC Číslo archívnej kópie 39312 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov Higher-order anisotropies in the blast-wave model: Disentangling flow and density field anisotropies Aut.údaje Jakub Cimerman ... [et al.] Autor Cimerman Jakub 1994- (45%)
Spoluautori Tomášik Boris 1972- (45%) UMBFP06 - Katedra fyziky
Csanád Máté (5%)
Lökös Sándor (5%)
Zdroj.dok. The European Physical Journal A : Hadrons and Nuclei. Vol. 53, no. 8 (2017), pp. [1-13]. - Berlin : Springer, 2017 Kľúč.slová ultrarelativistic heavy ion collisions femtoscopy anisotropic flow Jazyk dok. angličtina Krajina Spojené štáty Systematika 53 Anotácia We formulate a generalisation of the blast-wave model which is suitable for the description of higher-order azimuthal anisotropies of the hadron production. The model includes anisotropy in the density profile as well as an anisotropy in the transverse expansion velocity field. We then study how these two kinds of anisotropies influence the single-particle distributions and the correlation radii of two-particle correlation functions. Particularly we focus on the third-order anisotropy and consideration is given averaging over different orientations of the event plane. Kategória publikačnej činnosti ADC Číslo archívnej kópie 41756 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov Scalar quanta in Fermi liquids: zero sounds, instabilities, Bose condensation, and a metastable state in dilute nuclear matter Aut.údaje E. E. Kolomeitsev, D. N. Voskresensky Autor Kolomeitsev Evgeni E. 1970- (99%) UMBFP06 - Katedra fyziky
Spoluautori Voskresensky Dmitri (1%)
Zdroj.dok. The European Physical Journal A : Hadrons and Nuclei. Vol. 52, no. 12 (2016), pp. [1-18]. - Berlin : Springer, 2016 Kľúč.slová heavy ion collisions equation of state relativistic mean-field models hydrodynamics Jazyk dok. angličtina Krajina Spojené štáty Systematika 53 Anotácia The spectrum of bosonic scalar-mode excitations in a normal Fermi liquid with local scalar interaction is investigated for various values and momentum dependence of the scalar Landau parameter f(0) in the particle-hole channel. For f(0) > 0 the conditions are found when the phase velocity on the spectrum of zero sound acquires a minimum at non-zero momentum. For1 < f(0) < 0 there are only damped excitations, and for f(0) <1 the spectrum becomes unstable against the growth of scalar-mode excitations. An effective Lagrangian for the scalar excitation modes is derived after performing a bosonization procedure. We demonstrate that the instability may be tamed by the formation of a static Bose condensate of the scalar modes. The condensation may occur in a homogeneous or inhomogeneous state relying on the momentum dependence of the scalar Landau parameter. We show that in the isospin-symmetric nuclear matter there may appear a metastable state at subsaturation nuclear density owing to the condensate. Then we consider a possibility of the condensation of the zero-sound-like excitations in a state with a nonzero momentum in Fermi liquids moving with overcritical velocities, provided an appropriate momentum dependence of the Landau parameter f(0)( k) > 0. We also argue that in peripheral heavy-ion collisions the Pomeranchuk instability may occur already for f(0) >1. Kategória publikačnej činnosti ADC Číslo archívnej kópie 38091 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný
Názov HBT radii from the multipole Buda-Lund model Aut.údaje Sándor Lökös ... [et al.] Autor Lökös Sándor (10%)
Spoluautori Csanád Máté (10%)
Tomášik Boris 1972- (70%) UMBFP06 - Katedra fyziky
Csörgő Tamás (10%)
Zdroj.dok. Acta Physica Polonica B : proceedings supplement. Vol. 9, no. 2 (2016), pp. 269-274. - Kraków : Faculty of Physics, Astronomy and Applied Computer Science, 2016 ; WPCF 2015 - workshop on particle correlations and femtoscopy workshop Kľúč.slová fyzika - physics ťažké kovy - heavy metals heavy ion collisions Jazyk dok. angličtina Krajina Poľsko Systematika 53 Kategória publikačnej činnosti AFC Číslo archívnej kópie 37333 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika nerozpoznaný