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Nuclear Theory·nucl-th

Friday·February 17, 2023

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    [Submitted on 10 Nov 2022] (cross-list from nucl-ex)

    Exploring sQGP and Small Systems

    Debasish Das🇮🇳

    A strongly interacting Quark-Gluon Plasma (sQGP) is created in the high energy heavy ion collisions at RHIC and LHC. Our present understanding of sQGP as a very good liquid with astonishingly low viscosity is reviewed. With the arrival of the interesting results from LHC in high-energy p+p and p+A, a new endeavour to characterize the transition from these small systems to heavy ions (A+A) is now in place, since, even the small systems showed prominent similarities to heavy ions in the rising multiplicity domains. An outlook of future possibilities for better measurements is also made at the end of this brief review.

    Comments:
    Published in Int. J. of Mod. Phys. A; https://inspirehep.net/literature/1917911
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2211.05330 [pdf]
    Int.J.Mod.Phys.A(2021)·4 citations
  2. 09

    [Submitted on 15 Feb 2023] (cross-list from astro-ph.HE)

    Searching for phase transitions in neutron stars with modified Gaussian processes

    Debora Mroczek🇺🇸 · M. Coleman Miller🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Nicolas Yunes🇺🇸

    Gaussian processes provide a promising framework by which to extrapolate the equation of state (EoS) of cold, catalyzed matter beyond times nuclear saturation density. Here we discuss how to extend Gaussian processes to include nontrivial features in the speed of sound, such as bumps, kinks, and plateaus, which are predicted by nuclear models with exotic degrees of freedom. Using a fully Bayesian analysis incorporating measurements from X-ray sources, gravitational wave observations, and perturbative QCD results, we show that these features are compatible with current constraints and report on how the features affect the EoS posteriors.

    Comments:
    10 pages, 4 figures, CSQCD IX proceedings
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2302.07978 [pdf]
    J.Phys.Conf.Ser.(2023)·15 citations
  3. 10

    [Submitted on 16 Feb 2023] (cross-list from nucl-ex)

    Collective Excitation in High-Energy Nuclear Collisions -- In Memory of Professor Lianshou Liu

    Huan Zhong Huang🇺🇸 · Feng Liu🇨🇳 · Xiaofeng Luo🇨🇳 · Shusu Shi🇨🇳 · Fuqiang Wang🇺🇸 · Nu Xu🇺🇸

    We celebrate the legacies of our friend and mentor Professor Lianshou Liu who was one of the pioneers for the phenomenology of multi-particle interactions and initiated the physics of relativistic heavy-ion collisions in China. In this article, we discuss some of the recent exciting experimental observations on the collective phenomena including collectivity, chirality, criticality, strangeness production, and thermal equilibrium in high-energy nuclear collisions. Future directions, especially the physics at high baryon density, will be discussed with a focus on the first-order phase boundary and hyperon-nucleon interactions.

    Comments:
    20 pages, 10 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2302.08299 [pdf]
    Symmetry(2023)·6 citations
  4. 11

    [Submitted on 16 Feb 2023] (cross-list from hep-ph)

    Properties of Infinite Nuclear Medium from QCD Sum Rules and the Neutron Star-Black Hole Mass Gap

    Bijit Singha🇮🇳 · Debasish Das🇮🇳 · Leonard S. Kisslinger🇺🇸

    A non-perturbative framework is provided to connect QCD with nuclear phenomenology in the intermediate and high density regime. Using QCD Sum Rules, in-medium scalar and vector self-energies of nucleons are calculated as functions of the density of an infinite nuclear medium. The self-energies are used in the relativistic mean field theory lagrangian of a high-density nuclear medium to find the binding energy of in-medium nucleons and the value of light quark condensate, , in the Borel-improved resummation scheme. The critical mass of an ideal neutron star is obtained by coupling a uniform saturation energy density of cold, dense nuclear matter to Einstein equation in hydrostatic equilibrium. Since it is less likely for a neutron star core to avoid deconfinement and enter the rigid vector repulsion phase where the speed of sound can smoothly approach from conformal to causal limit, a gap should exist in the stellar mass spectrum, , where it would be rare to find any isolated, cold, non-rotating neutron star or a black hole.

    Comments:
    3 Figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2302.08372 [pdf]
    2 citations
  5. 12

    [Submitted on 16 Feb 2023] (cross-list from nucl-ex)

    Cross-shell states in C: a test for p-sd interactions

    J. Lois-Fuentes🇪🇸 · B. Fernández-Domínguez🇪🇸 · X. Pereira-López🇪🇸 · F. Delaunay🇫🇷 · W. N. Catford🇬🇧 · A. Matta🇬🇧 · N. A. Orr🇫🇷 · T. Duguet🇫🇷 · T. Otsuka🇯🇵 · V. Somà🇫🇷 · O. Sorlin🇫🇷 · T. Suzuki🇯🇵 and 50 other authors

    The low-lying structure of C has been investigated via the neutron-removal C reaction. Along with bound neutron sd-shell hole states, unbound p-shell hole states have been firmly confirmed. The excitation energies and the deduced spectroscopic factors of the cross-shell states are an important measure of the neutron configurations in C. Our results show a very good agreement with shell-model calculations using the SFO-tls interaction for C. However, a modification of the - and - monopole terms was applied in order to reproduce the isotone O. In addition, the excitation energies and spectroscopic factors have been compared to the first calculations of C with the self-consistent Green's function method employing the NNLO interaction. The results show the sensitivity to the size of the shell gap and highlight the need of going beyond the current truncation scheme in the theory.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2302.08382 [pdf]
    PLB(2023)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE