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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 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 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