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Title Hybrid model with viscous relativistic hydrodynamics: a role of constraints on the shear-stress tensor Author info A. S. Khvorostukhin ... [et al.] Author Khvorostukhin A. S. (34%)
Co-authors Kolomeitsev Evgeni E. 1970- (33%) UMBFP06 - Katedra fyziky
Toneev V. D. (33%)
Source document The European Physical Journal A : Hadrons and Nuclei. Vol. 57, no. 10 (2021), pp. 294-1-294-25. - New York : Springer Nature, 2021 Keywords relativistic hydrodynamics heavy ion collisions viscosity Form. Descr. články - journal articles Language English Country Germany Annotation 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 Public work category ADC No. of Archival Copy 50708 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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Title The effect of momentum deposition during fireball evolution on flow anisotropy Author info Martin Schulc, Boris Tomášik Author Schulc Martin (30%)
Co-authors Tomášik Boris 1972- (70%) UMBFP06 - Katedra fyziky
Source document Journal of Physics G: Nuclear and Particle Physics. Vol. 43, no. 12 (2016), art. no. 125106, pp. [1-11]. - Bristol : IOP Publishing, 2016 Keywords relativistická hydrodynamika anizotropný tok Language English Country Great Britian systematics 53 Public work category ADC No. of Archival Copy 37633 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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Title Hydrodynamic modeling of QGP expansion using an exact solution of Riemann problem Author info Zuzana Fecková, Boris Tomášik Author Fecková Zuzana 1988- (50%)
Co-authors Tomášik Boris 1972- (50%) UMBFP06 - Katedra fyziky
Source document Journal of Physics: Conference Series. Vol. 668 (2016), pp. 1-4. - Bristol : IOP Publishing, 2016 ; SQM 2015 medzinárodná konferencia Keywords relativistická hydrodynamika relativistic hydrodynamics Language English Country Great Britian systematics 53 Public work category AFC No. of Archival Copy 34380 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised
Title A new hydrodynamic model using an exact Riemann solver Author info Zuzana Fecková, Boris Tomášik Author Fecková Zuzana 1988- (50%)
Co-authors Tomášik Boris 1972- (50%) UMBFP06 - Katedra fyziky
Source document Acta Physica Polonica B : proceedings supplement. Vol. 8, no. 2 (2015), pp. 307-312. - Kraków : Jagellonian University, 2015 Keywords relativistická hydrodynamika relativistic hydrodynamics Riemannova geometria - Riemannian geometry Language Slovak Country Poland systematics 53 Public work category ADM No. of Archival Copy 34316 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised
Title A new shock-capturing numerical scheme for ideal hydrodynamics Author info Zuzana Fecková, Boris Tomášik Author Fecková Zuzana 1988- (50%)
Co-authors Tomášik Boris 1972- (50%) UMBFP06 - Katedra fyziky
Source document Journal of physics : conference series. Vol. 612 (2015), pp. 1-4. - Bristol : IOP Publishing, 2015 ; Hot Quarks 2014 workshop pre mladých vedcov Keywords relativistická hydrodynamika relativistic hydrodynamics fyzika - physics Language English Country Great Britian systematics 53 Public work category AFC No. of Archival Copy 34319 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ unrecognised
Title Spectra, elliptic flow and azimuthally sensitive HBT radii from Buda-Lund model for root s(NN) = 200 GeV Au+Au collisions Author info Andras Ster ... [et al.] Author Ster Andras (20%)
Co-authors Csanád Máté (20%)
Csörgő Tamás (20%)
Lörstad Bengt (20%)
Tomášik Boris 1972- (20%) UMBFP06 - Katedra fyziky
Source document The European Physical Journal A : Hadrons and Nuclei. Vol. 47, no. 4 (2011), p. 58. - Berlin : Springer, 2011 Keywords femtoscopy heavy ion collisions relativistic hydrodynamics Language English systematics 539 Public work category ADC No. of Archival Copy 19835 Repercussion category MOUNT, E., GRAEF, G., MITROVSKI, M. et al. Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion colllisions. In Physical Review C. ISSN 0556-2813, 2011, vol. 84, no. 1-
Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised