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Nuclear Theory·nucl-th

Tuesday·January 6, 2015

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 4 Jan 2015] (cross-list from cond-mat.quant-gas)

    Running condensate in moving superfluid

    E.E. Kolomeitsev · D.N. Voskresensky

    A possibility of the condensation of excitations with non-zero momentum in moving superfluid media is considered in terms of the Ginzburg-Landau model. The results might be applicable to the superfluid He, ultracold atomic Bose gases, various superconducting and neutral systems with pairing, like ultracold atomic Fermi gases and the neutron component in compact stars. The order parameters, the energy gain, and critical velocities are found.

    Comments:
    6 pages, 1 figure
    Subjects:
    Quantum Gases (cond-mat.quant-gas); High Energy Astrophysical Phenomena (astro-ph.HE); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    1501.00731 [pdf]
    2 citations
  2. 06

    [Submitted on 5 Jan 2015] (cross-list from hep-ph)

    An Estimate of the Thermodynamic Pressure in High-Energy Collisions

    Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo and WLCAPP, Cairo)🇪🇬

    We introduce a novel approach to estimate the thermodynamic pressure from heavy-ion collisions based on recently measured higher-order moments of particle multiplicities by the STAR experiment. We start with fitting the experimental results in the most-central collisions. Then, we integrate them back to lower ones. For example, we find that the first-order moment, the mean multiplicity, is exactly reproduced from the integral of variance, the second-order moment. Therefore, the zero-order moment, the thermodynamic pressure, can be estimated from the integral of the mean multiplicity. the possible comparison between such a kind of pressure (deduced from the integral of particle multiplicity) and the lattice pressure and the relating of Bjorken energy density to the lattice energy density are depending on lattice QCD at finite baryon chemical potential and first-principle estimation of the formation time of the quark-gluon plasma (QGP).

    Comments:
    16 pages, 7 figures with 13 eps graphs to appear in Int. J. Mod. Phys. A
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1501.00812 [pdf]
    Int.J.Mod.Phys.A(2015)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE