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Nuclear Theory·nucl-th

Friday·July 24, 2015

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 23 Jul 2015]

    Entropy production in the early-cosmology pionic phase

    Antonio Dobado🇪🇸 · Felipe J. Llanes-Estrada (U. Complutense Madrid)🇪🇸 · David Rodriguez-Fernandez (U. Oviedo)🇪🇸

    We point out that in the early universe, for temperatures in the approximate interval 175-80 MeV (after the quark-gluon plasma), pions carried a large share of the entropy and supported the largest inhomogeneities. Thus, we examine the production of entropy in a pion gas, particularizing to inhomogeneities of the temperature, for which we benefit from the known thermal conductivity. We finally put that entropy produced in relaxing such thermal inhomogeneities in the broad context of this relatively unexplored phase of early-universe cosmology.

    Comments:
    10 pages, 10 figures,
    Subjects:
    Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1507.06386 [pdf]
    Int.J.Mod.Phys.A(2016)·3 citations
  2. 02

    [Submitted on 23 Jul 2015]

    Matching the Hagedorn mass spectrum with Lattice QCD results

    Pok Man Lo🇵🇱 · Michał Marczenko🇵🇱 · Krzysztof Redlich🇩🇪 · Chihiro Sasaki🇩🇪

    Based on recent Lattice QCD (LQCD) results obtained at finite temperature, we discuss modeling of the hadronic phase of QCD in the framework of Hadron Resonance Gas (HRG) with discrete and continuous mass spectra. We focus on fluctuations of conserved charges, and show how a common limiting temperature can be used to constrain the Hagedorn exponential mass spectrum in different sectors of quantum number, through a matching of HRG and LQCD. For strange baryons, the extracted spectra are found to be consistent with all known and expected states listed by the Particle Data Group (PDG). The strange-mesonic sector, however, requires additional states in the intermediate mass range beyond that embodied in the database.

    Comments:
    8 pages, 4 figures, version to appear in phys. rev. c
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    1507.06398 [pdf]
    PRC(2015)·44 citations
  3. 03

    [Submitted on 23 Jul 2015]

    Non-Gaussian particle number fluctuations in vicinity of the critical point for van der Waals equation of state

    V. Vovchenko · R. V. Poberezhnyuk · D. V. Anchishkin · M. I. Gorenstein

    The non-Gaussian measures of the particle number fluctuations -- skewness and kurtosis -- are calculated in a vicinity of the critical point. This point corresponds to the end point of the first-order liquid-gas phase transition. The gaseous phase is characterized by the positive values of skewness while the liquid phase has negative skew. The kurtosis appears to be significantly negative at the critical density and supercritical temperatures. The skewness and kurtosis diverge at the critical point. The classical van der Waals equation of state in the grand canonical ensemble formulation is used in our studies. Neglecting effects of the quantum statistics we succeed to obtain the analytical expressions for the rich structures of the skewness and kurtosis in a wide region around the critical point. These results have universal form, i.e., they do not depend on particular values of the van der Waals parameters and . The strongly intensive measures of particle number and energy fluctuations are also considered and show singular behavior in the vicinity of the critical point.

    Comments:
    16 pages, 5 figures, number of figures reduced to avoid repetition, new references added, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.06537 [pdf]
    J.Phys.A(2016)·19 citations
  4. 04

    [Submitted on 23 Jul 2015]

    Transient oscillations in a macroscopic effective theory of the Boltzmann equation

    Dennis Bazow🇺🇸 · Mauricio Martinez🇺🇸 · Ulrich W. Heinz🇺🇸

    A new transient effective theory of the relativistic Boltzmann equation is derived for locally momentum-anisotropic systems. In the expansion of the distribution function around a local "quasi-equilibrium" state a non-hydrodynamic dynamical degree of freedom is introduced at leading order that breaks local momentum isotropy. By replacing the deviation of the distribution function from this quasi-equilibrium state in terms of moments of the leading-order distribution and applying a systematic power counting scheme that orders the non-hydrodynamic modes by their microscopic time scales, a closed set of equations for the dynamical degrees of freedom is obtained. Truncating this set at the level of the slowest non-hydroynamic mode we find that it exhibits transient oscillatory behavior -- a phenomenon previously found only in strongly coupled theories, where it appears to be generic. In weakly coupled systems described by the Boltzmann equation, these transient oscillations depend on the breaking of local momentum isotropy being treated non-perturbatively at leading order in the expansion of the distribution function.

    Comments:
    5 pages, 1 figure; minor changes, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1507.06595 [pdf]
    PRD(2016)·19 citations
  5. 05

    [Submitted on 22 Jul 2015]

    Fayans functional for deformed nuclei. Uranium region

    S.V. Tolokonnikov · I.N. Borzov · M. Kortelainen · Yu.S. Lutostansky · E.E. Saperstein

    Fayans energy density functional (EDF) FaNDF^0 has been applied to the nuclei around uranium region. Ground state characteristics of the Th, U and Pu isotopic chains, up to the two-neutron drip line, are found and compared with predictions from several Skyrme EDFs. The two-neutron drip line is found for FaNDF^0, SLy4 and SkM^* EDFs for a set of elements with even proton number, from Pb up to Fm.

    Comments:
    6 pages, 9 figures, to appear in the proceedings of the International Conference "Nuclear Structure and Related Topics", July 14 - July 18, 2015, Dubha, Russia
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1507.06607 [pdf]
    EPJ Web Conf.(2016)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE