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Nuclear Theory·nucl-th

Monday·December 14, 2020

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 10 Dec 2020] (cross-list from hep-ph)

    Pion crystals hosting topologically stable baryons

    Fabrizio Canfora🇨🇱 · Stefano Carignano🇪🇸 · Marcela Lagos🇨🇱 · Massimo Mannarelli🇮🇹 · Aldo Vera🇨🇱

    We construct analytic (3+1)-dimensional inhomogeneous and topologically non-trivial pion systems using chiral perturbation theory. We discuss the effect of isospin asymmetry with vanishing electromagnetic interactions as well as some particular configurations with non-vanishing electromagnetic interactions. The inhomogeneous configurations of the pion fields are characterized by a non-vanishing topological charge that can be identified with baryons surrounded by a cloud of pions. This system supports a topologically protected persistent superflow. When the electromagnetic field is turned on the superflow corresponds to an electromagnetic supercurrent.

    Comments:
    v2: extended discussion and added references; matches published version on Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2012.05921 [pdf]
    PRD(2021)·36 citations
  2. 05

    [Submitted on 11 Dec 2020] (cross-list from hep-ph)

    Collisional energy loss and the Chiral Magnetic Effect

    Jeremy Hansen🇺🇸 · Kirill Tuchin🇺🇸

    Collisional energy loss of a fast particle in a medium is mostly due to the medium polarization by the electromagnetic fields of the particle. A small fraction of energy is carried away by the Cherenkov radiation. In chiral medium there is an additional contribution to the energy loss due to induction of the anomalous current proportional to the magnetic field. It causes the particle to lose energy mostly in the form of the \emph{chiral} Cherenkov radiation. We employ classical electrodynamics, adequate in a wide range of particle energies, to compute the collisional energy loss by a fast particle in a homogenous chiral plasma and apply the results to Quark-Gluon Plasma and a Weyl semimetal. In the later case photon spectrum is strongly enhanced in the ultraviolet and X-ray regions which makes it amenable to experimental investigation. Our main observation is that while the collisional energy loss in a non-chiral medium is a slow, at most logarithmic, function of energy , the chiral Cherenkov radiation is proportional to when the recoil is neglected and to when it is taken into account.

    Comments:
    13 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nuclear Theory (nucl-th)
    arXiv:
    2012.06089 [pdf]
    PRC(2021)·12 citations
  3. 06

    [Submitted on 11 Dec 2020] (cross-list from hep-ph)

    Dijet Acoplanarity in CUJET3 as a Probe of the Nonperturbative Color Structure of QCD Perfect Fluids

    M. Gyulassy🇺🇸 · P.M. Jacobs🇺🇸 · J. Liao🇺🇸 · S. Shi🇨🇦 · X.N. Wang🇺🇸 · F.Yuan🇺🇸

    Using the CUJET3=DGLV+VISHNU jet-medium interaction framework, we show that dijet azimuthal acoplanarity in high energy collisions is sensitive to possible non-perturbative enhancement of the jet transport coefficient, , in the QCD crossover temperature MeV range. With jet-medium couplings constrained by global RHIC\& LHC fits to nuclear modification data on , we compare predictions of the medium induced dijet transverse momentum squared, , in two models of the temperature, , and jet energy dependence of the jet medium transport coefficient, . In one model, wQGP, only perturbative quark and gluon dof are assumed. In the second model, sQGMP, nonperturbative three component semi-Quark-Gluon and Magnetic Monopole dof are asssumed. We show that the dijet path averaged medium induced azimuthal acoplanarity, , in sQGMP is robustly a factor of larger than in perturbative wQGP while the radiative energy loss in both models is nearly identical as required to fit the same single jet nuclear modification data. Future A+A dijet acoplanarity measurements correlated with and azimuthal asymmetry measurements therefore appears to be a promising strategy to search for possible signatures of critical opalescence like phenomena in the QCD confinement temperature range.

    Comments:
    4 pages, 5 figures, Published in the Proceedings of XXVIIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2019)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2012.06151 [pdf]
    NPA(2021)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE