PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·February 8, 2022

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 7 Feb 2022]

    Kaon meson condensate in neutron star matter including hyperons

    Fu Ma🇨🇳 · Wenjun Guo🇨🇳 · Chen Wu🇨🇳

    The recent measurement of the mass of neutron stars (PSR J1614 - 2230, PSR J0348 + 0432, MSP J0740 + 6620) restricts the lower limit of the maximum mass of such compact stars, making it possible for dense matter to exist in massive stars. The relativistic mean field theory with parameter sets FSUGold including Kaon condensation is used to describe the properties of neutron stars in equilibrium. Through careful choice of the parameter of the -cut , we are able to produce a maximum mass neutron star with Kaon condensation heavier than , and we find that the parameter of the interaction term in this model has a significant effect on condensation. In the case of using -cut scheme, condensation occurs only when the interaction is switched off.

    Comments:
    9 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2202.03001 [pdf]
    PRC(2022)·35 citations
  2. 02

    [Submitted on 7 Feb 2022]

    Dynamics of rotation in chiral nuclei

    Z. X. Ren🇨🇳 · P. W. Zhao🇨🇳 · J. Meng🇨🇳

    The dynamics of chiral nuclei is investigated for the first time with the time-dependent and tilted axis cranking covariant density functional theories on a three-dimensional space lattice in a microscopic and self-consistent way. The experimental energies of the two pairs of the chiral doublet bands in Nd are well reproduced without any adjustable parameters beyond the well-defined density functional. A novel mechanism, i.e., chiral precession, is revealed from the microscopic dynamics of the total angular momentum in the body-fixed frame, whose harmonicity is associated with a transition from the planar into aplanar rotations with the increasing spin. This provides a fully microscopic and dynamical view to understand the chiral excitations in nuclei.

    Comments:
    7 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2202.03043 [pdf]
    PRC(2022)·33 citations
  3. 03

    [Submitted on 7 Feb 2022]

    Quantum Computing for Heavy Quarkonium Spectroscopy

    Daniel Gallimore🇺🇸 · Jinfeng Liao🇺🇸

    We report a first demonstration for the application of quantum computing to heavy quarkonium spectroscopy study. Based on a Cornell-potential model for the heavy quark and antiquark system, we show how this Hamiltonian problem can be formulated and solved with the VQE approach on the IBM cloud quantum computing platform. Errors due to a global depolarizing noise channel are corrected with a zero-noise extrapolation method, resulting in good agreement with the expected value. We also extend the calculation to excited states on a noiseless quantum simulator by orthogonalization with respect to the ground state.

    Comments:
    Version accepted by Phys.Rev.D
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2202.03333 [pdf]
    PRD(2023)·11 citations
  4. 04

    [Submitted on 7 Feb 2022]

    Mini-jet quenching in a concurrent jet+hydro evolution and the non-equilibrium quark-gluon plasma

    Daniel Pablos🇮🇹 · Mayank Singh🇺🇸 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    Mini-jets, created by perturbative hard QCD collisions at moderate energies, can represent a significant portion of the total multiplicity of a heavy-ion collision event. Since their transverse momenta are initially larger than the typical saturation scale describing the bulk of the equilibrating QGP, their typical stopping distances are larger than the usual hydrodynamization time, so they do not in general hydrodynamize at the same pace than the bulk of the collision. Therefore, in general mini-jets cannot be described solely by a unique pre-equilibrium stage that bridges the initial, over-occupied glasma state, with the hydrodynamical evolution. In this work we make use of a new concurrent mini-jet+hydrodynamic framework in which the properties of the hydrodynamically evolving QGP are modified due to the injection of energy and momentum from the mini-jets. We study the system for different choices of the minimum transverse momentum associated to mini-jet production. In order to achieve a realistic description of charged particle multiplicity, the amount of entropy associated to the low- initial state needs to be reduced. Moreover, the fact that the injected momentum from the randomly oriented mini-jets is not correlated with the spatial gradients of the system reduces overall flow, and the value of the QGP transport coefficients needs to be reduced accordingly. They are an important new source of fluctuations, resulting in a spikier, notably modified hydrodynamical evolution. We discuss the impact of the mini-jets on a number of observables, such as spectra and -differential flow for a wide range of centrality classes. In contrast to elliptic, triangular or quadrangular flow, we find that directed flow, , has the strongest potential to discriminate between different mini-jet production rates.

    Comments:
    Matches published version. Typos fixed, figure added
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2202.03414 [pdf]
    PRC(2022)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE