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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 
article
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 Scalar quanta in Fermi liquids: zero sounds, instabilities, Bose condensation, and a metastable state in dilute nuclear matter Author info E. E. Kolomeitsev, D. N. Voskresensky Author Kolomeitsev Evgeni E. 1970- (99%) UMBFP06 - Katedra fyziky
Co-authors Voskresensky Dmitri (1%)
Source document The European Physical Journal A : Hadrons and Nuclei. Vol. 52, no. 12 (2016), pp. [1-18]. - Berlin : Springer, 2016 Keywords heavy ion collisions equation of state relativistic mean-field models hydrodynamics Language English Country United States of America systematics 53 Annotation 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. Public work category ADC No. of Archival Copy 38091 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 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 Stimulation of static deconfined medium by multiple hard partons Author info Martin Schulc, Boris Tomášik Author Schulc Martin (50%)
Co-authors Tomášik Boris 1972- (50%) UMBFP06 - Katedra fyziky
Source document Journal of Physics G: Nuclear and Particle Physics. Vol. 40, no. 12 (2013), pp. [1-11]. - Bristol : IOP Publishing, 2013 Keywords heavy ion collisions hydrodynamics Language English Country Great Britian systematics 53 Public work category ADC No. of Archival Copy 27640 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 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
Title Riemann solvers and numerical methods for fluid dynamics Subtitle a practical introdiction Author info Eleuterio F. Toro Author Toro Eleuterio F.
Issue data Berlin : Springer , 2009. - 724 s. : il., 24 cm Issue 3rd ed. ISBN 978-3-540-25202-3 Note Bibliografia s. 687-718. Register Keywords Eulerov vzorec hydrodynamika Euler’s formula rovnice - equations hydrodynamics Language English Country Germany systematics 51 551.511.32 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xkni - BOOKS Copy count 1, currently available 0, at library only 1 
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Call number Location Sublocation Umiestnenie Info 335232 Univerzita Mateja Bela Department of physics In-Library Use Only Title Freeze-out by bulk viscosity driven instabilities Author info Giorgio Torrieri, Boris Tomášik, Igor Mishustin Author Torrieri Giorgio (70%)
Co-authors Tomášik Boris 1972- (15%) UMBFP06 - Katedra fyziky
Mishustin Igor (15%)
Source document Acta Physica Polonica B. Vol. 39, no. 7 (2008), pp. 1733-1744. - Kraków : Jagellonian University, 2008 Keywords heavy ion collisions deconfinement phase transition hydrodynamics bulk viscosity freeze-out Language English Country Poland systematics 539 Annotation We describe a new scenario (first introduced in [G.Torrieri, B.Tomasik and I.Mishustin, Phys. Rev. C 77, 034903 (2008)]) for freezeout in heavy ion collisions that could solve the lingering problems associated with the so-called HBT puzzle. We argue that bulk viscosity increases as $T$ approaches $T_c$. The fluid {then} becomes unstable against small perturbations, and fragments into clusters of a size much smaller than the total size of the system. These clusters maintain the pre-existing outward-going flow, as a spray of droplets, but develop no flow of their own, and hadronize by evaporation. We show that this scenario can explain HBT data and suggest how it can be experimentally tested Public work category ADC No. of Archival Copy 9792 Repercussion category RAJAGOPAL, Krishna - TRIPURANENI, Nilesh. Bulk viscosity and cavitation in boost-invariant hydrodynamic expansion. In Journal of high energy physics. ISSN 1029-8479, 2010, no. 3, article no. 94025.
MATEOS, David - TRANCANELLI, Diego. Anisotropic N=4 Super-Yang-Mills Plasma and Its Instabilities. In Physical review letters. ISSN 0031-9007, 2011, vol. 107, no. 10, article no. 101601.
MATEOS, David - TRANCANELLI, Diego. Thermodynamics and instabilities of a strongly coupled anisotropic plasma. In Journal of high energy physics. ISSN 1029-8479, 2011, no. 7, article no. 054.
CHANDRA, Vinod. Bulk viscosity of anisotropically expanding hot QCD plasma. In Physical review D. ISSN 1550-7998, 2011, vol. 84, no. 9, article no. 018.
Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised