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Nuclear Theory·nucl-th

Thursday·November 16, 2017

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    [Submitted on 14 Nov 2017]

    The equilibrium and dynamical cumulants of QCD chiral order parameter with parametric Landau free energy

    Lijia Jiang🇨🇳 · Horst Stoecker🇩🇪 · Jun-Hui Zheng🇨🇳

    By linearly parameterizing the QCD Landau free energy near the critical point in the baryon chemical potential and temperature plane, we study the fluctuations of the QCD chiral order parameter field (the field) in the equilibrium case and dynamical phase transition, respectively. By setting the system size to the typical size of the QGP fireball ( fm), we show that in the equilibrium case, the discontinuity of the order parameter in the first order phase transition region is replaced by smooth crossover, and the corresponding fluctuations are broadened. Meanwhile, the quartic cumulant of the field is generally negative near the phase transition line. We further derive the dynamical evolution of the QCD Landau free energy in the Fokker-Plank framework, based on which we deduce the dynamical cumulants of the field. Assuming the temperature decreases as a known function of time, we numerically evaluate the dynamical cumulants and confirm that the cumulants present clear memory effects. Moreover, the memory effects on the first order phase transition side is stronger than that on the crossover side, and the dynamical cumulants at the hypothetical freeze-out line present rich non-monotonic structures.

    Comments:
    9 pages, 5 figures. Fig.2 is replaced. More discussions are added. Published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.05339 [pdf]
    EPJC(2023)·8 citations
  2. 02

    [Submitted on 15 Nov 2017]

    Perturbative accelerating solutions of relativistic hydrodynamics

    Balint Kurgyis🇭🇺 · Mate Csanad🇭🇺

    In ultra-relativistic collisions of heavy ions, the strongly interacting Quark Gluon Plasma (sQGP) is created. The fluid nature of the sQGP was one of the important discoveries of high energy heavy ion physics in the last decades. Henceforth the explosion of this matter may be described by hydrodynamical models. Besides numerical simulations, it is important to study the analytic solutions of the equations of hydrodynamics, as these enable us to understand the connection of the final and initial states better. In this paper we present a perturbative, accelerating solution of relativistic hydrodynamics, on top of a known class of solutions describing Hubble-expansion. We describe the properties of this class of perturbative solutions, and investigate a few selected solutions in detail.

    Comments:
    Presented at the Bolyai-Gauss-Lobachevsky 2017 conference
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.05446 [pdf]
    Universe(2017)·3 citations
  3. 03

    [Submitted on 14 Nov 2017]

    Light cluster production at NICA

    N.-U. Bastian🇵🇱 · D. Blaschke🇵🇱 · G. Röpke🇷🇺

    In a recent publication the importance of measuaring light clusters at future NICA and FAIR experiments as "rare probes" for in-medium characteristics was presented. Within theoretical conciderations is shown how clusters would be affected by medium affects as given collider energies.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.05631 [pdf]
    Acta Phys.Polon.Supp.(2017)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE