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Nuclear Theory·nucl-th

Wednesday·December 15, 2021

13 papers—3 primary·10 cross-listed

All13Primary3Cross-lists10
  1. 01

    [Submitted on 14 Dec 2021]

    Structure of two- and three-alpha systems in cold neutron matter

    H. Moriya · H. Tajima · W. Horiuchi · K. Iida · E. Nakano

    We present stability and structure of two- and three-alpha systems embedded in dilute cold neutron matter. By solving a few-alpha Schrödinger equation with quasiparticle properties, i.e., effective mass and induced two- and three-alpha interactions, which are evaluated in terms of Fermi polarons, it is shown that and the Hoyle state become bound at densities of about and of the saturation density, respectively. It is also seen that, under cold neutron matter environment, both systems become smaller than the corresponding systems in vacuum. Our results would affect astrophysical models for stellar collapse and neutron star mergers, as well as relevant reaction rates for nucleosynthesis.

    Comments:
    3 pages, 1 figure, contribution to the 16th International Symposium on Nuclei in the Cosmos (NIC-XVI), 21-25 Sep. 2021
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2112.07113 [pdf]
    EPJ Web Conf.(2022)·0 citations
  2. 02

    [Submitted on 14 Dec 2021]

    Estimation of transport coefficients of dense hadronic and quark matter

    Debashree Sen🇮🇳 · Naosad Alam🇮🇳 · Sabyasachi Ghosh🇮🇳

    We calculate the transport coefficients like shear viscosity and electrical conductivity with respect to density of dense hadronic and quark matter. By considering the simple massless limit for the quark matter and two different effective models for the hadronic matter, we have estimated the transport coefficients of the two phases separately. We have sketched the density profile of the transport coefficients in two parts viz. the phase-space part and the relaxation time part. By calculating the shear viscosity to density ratio, we have also explored the nearly perfect fluid domain of the quark and hadronic matter.

    Comments:
    22 pages, 7 figures; Accepted for Publication in Chinese Physics C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2112.07404 [pdf]
    CPC(2023)·4 citations
  3. 03

    [Submitted on 14 Dec 2021]

    Embedding a critical point in a hadron to quark-gluon crossover equation of state

    J. I. Kapusta🇺🇸 · C. Plumberg🇺🇸 · T. Welle🇺🇸

    Lattice QCD simulations have shown unequivocally that the transition from hadrons to quarks and gluons is a crossover when the baryon chemical potential is zero or small. Many model calculations predict the existence of a critical point at a value of the chemical potential where current lattice simulations are unreliable. We show how to embed a critical point in a smooth background equation of state so as to yield the critical exponents and critical amplitude ratios expected of a transition in the same universality class as the liquid-gas phase transition and the 3D Ising model. The resulting equation of state has parameters which may be inferred by hydrodynamic modeling of heavy ion collisions in the Beam Energy Scan II at the Relativistic Heavy Ion Collider or in experiments at other accelerators.

    Comments:
    4 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2112.07563 [pdf]
    Acta Phys.Polon.Supp.(2023)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE