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Nuclear Theory·nucl-th

Wednesday·August 14, 2019

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 12 Aug 2019] (cross-list from hep-ph)

    From Non-interacting to Interacting Picture of Thermodynamics and Transport Coefficients for Quark Gluon Plasma

    Sarthak Satapathy🇮🇳 · Souvik Paul🇮🇳 · Ankit Anand🇮🇳 · Ranjesh Kumar🇮🇳 · Sabyasachi Ghosh🇮🇳

    We have attempted to build first some simplified model to map the interaction of quarks and gluons, which can be contained by their thermodynamical quantity like entropy density, obtained from calculation of lattice quantum chromo dynamics (LQCD). With respect to entropy density of the standard non-interacting massless quark gluon plasma (QGP), its interacting values from LQCD simulation are reduced as we go from higher to lower temperature through the cross-over of quark-hadron phase transition. By parameterizing increasing degeneracy factor or increasing interaction-fugacity or decreasing thermal width of quarks and gluons with temperature, we have matched LQCD data.Using that interaction picture, shear viscosity and electrical conductivity are calculated. For getting nearly perfect fluid nature of QGP, interaction might have some role when we consider temperature dependent thermal width.

    Comments:
    17 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1908.04330 [pdf]
    J.Phys.G(2020)·12 citations
  2. 05

    [Submitted on 12 Aug 2019] (cross-list from hep-ph)

    From Non-interacting to Interacting Picture of Quark Gluon Plasma in presence of magnetic field and its fluid property

    Jayanta Dey🇮🇳 · Sarthak Satapathy🇮🇳 · Ankita Mishra🇮🇳 · Souvik Paul🇮🇳 · Sabyasachi Ghosh🇮🇳

    We have attempted to build a parametric based simplified and analytical model to map the interaction of quarks and gluons in presence of magnetic field, which has been constrained by quark condensate and thermodynamical quantities like pressure, energy density etc., obtained from the calculation of lattice quantum chromodynamics. To fulfill that mapping, we have assumed a parametric temperature and magnetic field dependent degeneracy factor, average energy, momentum and velocity of quarks and gluons. Implementing this QCD interaction in calculation of transport coefficient at finite magnetic field, we have noticed that magnetic field and interaction both are two dominating sources, for which the values of transport coefficients can be reduced. Though the methodology is not so robust, but with the help of its simple parametric expressions, one can get a quick rough estimation of any phenomenological quantity, influenced by temperature and magnetic field dependent QCD interaction.

    Comments:
    Accepted in IJMPE
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1908.04335 [pdf]
    IJMPE(2021)·40 citations
  3. 06

    [Submitted on 11 Aug 2019] (cross-list from hep-ph)

    Light particle and quark chemical potentials from negatively to positively charged particle yield ratios corrected by removing strong and weak decays

    Hai-Ling Lao🇨🇳 · Ya-Qin Gao🇨🇳 · Fu-Hu Liu🇨🇳

    The yield ratios of negatively to positively charged pions (), negatively to positively charged kaons (), and anti-protons to protons () produced in mid-rapidity interval in central gold-gold (Au-Au) collisions, central lead-lead (Pb-Pb) collisions, and inelastic (INEL) or non-single-diffractive (NSD) proton-proton () collisions, as well as in forward rapidity region in INEL collisions are analyzed in the present work. Over an energy range from a few GeV to above 10 TeV, the chemical potentials of light flavor particles (pion, kaon, and proton) and quarks (up, down, and strange quarks) are extracted from the mentioned yield ratios in which the contributions of strong decay from high-mass resonance and weak decay from heavy flavor hadrons are removed. Most energy dependent chemical potentials show the maximum at about 4 GeV, while the energy dependent yield ratios do not show such an extremum.

    Comments:
    11 pages, 3 figures. Advances in High Energy Physics, accepted. arXiv admin note: text overlap with arXiv:1806.04309
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1908.04678 [pdf]
    Adv.High Energy Phys.(2020)·4 citations
  4. 07

    [Submitted on 13 Aug 2019] (cross-list from cond-mat.quant-gas)

    Pairing in two-dimensional Fermi gases with a coordinate-space potential

    Tash Zielinski · Bernard Ross · Alexandros Gezerlis

    In this work we theoretically study pairing in two-dimensional Fermi gases, a system which is experimentally accessible using cold atoms. We start by deriving the mean-field pairing gap equation for a coordinate-space potential with a finite interaction range, and proceed to solve this numerically. We find that for sufficiently short effective ranges the answer is identical to the zero-range one. We then use Diffusion Monte Carlo to evaluate the total energy for many distinct particle numbers; we employ several variational parameters to produce a good ground-state energy and then use these results to extract the pairing gap across a number of interaction strengths in the strongly interacting two-dimensional crossover. Extracting the gap via the odd-even energy staggering, our microscopic results can be used as benchmarks for other theoretical approaches.

    Comments:
    9 pages, 10 figures; v2 corresponds to published version
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1908.04782 [pdf]
    PRA(2020)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE