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Nuclear Theory·nucl-th

Wednesday·September 15, 2021

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    [Submitted on 14 Sept 2021]

    hypernuclei based on interactions from chiral effective field theory

    Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪 · Andreas Nogga🇩🇪

    We investigate the existence of bound \break states in systems with baryons using the Jacobi NCSM approach in combination with chiral NN and N interactions. We find three shallow bound states for the NNN system (with , and ) with quite similar binding energies. The and hypernuclei are also clearly bound with respect to the thresholds and , respectively. The binding of all these systems is predominantly due to the attraction of the chiral N potential in the channel. A perturbative estimation suggests that the decay widths of all the observed states could be rather small.

    Comments:
    12 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2109.06648 [pdf]
    EPJA(2021)·25 citations
  2. 02

    [Submitted on 14 Sept 2021]

    Hydrodynamic attractor in the non-conformal Bjorken flow

    Zenan Chen🇨🇳 · Li Yan🇨🇳

    Non-conformal attractor behavior is studied by solving non-conformal second order viscous hydrodynamics with respect to boost-invariant plasmas. Numerical solutions of the relative decay rate of the enthalpy density, the inverse shear and bulk Reynolds numbers, all exhibit universal patterns towards an ideal fluid description at late stages, demonstrating the existence of non-conformal hydrodynamic attractor. However, as a generic feature, the non-conformal hydrodynamic attractor emerges only at late times, which differs drastically from the behavior observed in conformal systems. The absence of the early-time attractor in non-conformal fluids is a consequence of the early-time instable mode, which arises from a positive-valued eigen-mode associated with the free-streaming dynamics. To support practical simulations of hydrodynamics in high-energy heavy-ion collisions, early-time attractor can be restored in a mixture of the shear and the bulk viscous corrections, in which early-time instable modes cancel approximately. Early-time non-conformal attractor is also approachable, if the quadratic coupling between the bulk pressure and the expansion rate is enhanced by at least a factor of two through the transport coefficient .

    Comments:
    18 pages, 5 figures. Comments are welcome
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2109.06658 [pdf]
    PRC(2022)·11 citations
  3. 03

    [Submitted on 14 Sept 2021]

    Equation of state of neutron star matter and its warm extension with an interacting hadron resonance gas

    Yuki Fujimoto🇯🇵 · Kenji Fukushima🇯🇵 · Yoshimasa Hidaka🇯🇵 · Atsuki Hiraguchi🇹🇼 · Kei Iida🇯🇵

    We propose an interpolating equation of state that satisfies phenomenologically established boundary conditions in two extreme regimes at high temperature and low baryon density and at low temperature and high baryon density. We confirm that the hadron resonance gas model with the Carnahan-Starling excluded volume effect can reasonably fit the empirical equation of state at high density up to several times the normal nuclear density. We identify the onsets of strange particles and quantify the strangeness contents in dense matter. We finally discuss the finite temperature effects and estimate the thermal index as a function of the baryon density, which should be a crucial input for the core-collapse supernova and the binary neutron star merger simulations.

    Comments:
    9 pages, 6 figures; v2 published in PLB
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2109.06799 [pdf]
    PLB(2022)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE