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Nuclear Theory·nucl-th

Tuesday·January 10, 2023

16 papers—9 primary·7 cross-listed

All16Primary9Cross-lists7
  1. 10

    [Submitted on 7 Jan 2023] (cross-list from hep-ph)

    Simulations of momentum correlation functions of light (anti)nuclei in relativistic heavy-ion collisions at = 39 GeV

    Ting-Ting Wang🇨🇳 · Yu-Gang Ma🇨🇳 · Song Zhang🇨🇳

    Momentum correlation functions of light (anti)nuclei formed by the coalescence mechanism of (anti)nucleons are calculated for several central heavy-ion collision systems, namely , , as well as in different centralities at center of mass energy = 39 GeV within the framework of A Multi-Phase Transport (AMPT) model complemented by the Lednick and Lyuboshitz analytical method. Momentum correlation functions for identical or nonidentical light (anti)nuclei are constructed and analyzed for the above collision systems. The Au + Au results demonstrate that emission of light (anti)nuclei occurs from a source with smaller space extent in more peripheral collisions. The effect of system-size on the momentum correlation functions of identical or nonidentical light (anti)nuclei is also explored by several collision system in central collisions. The results indicate that the emission source-size of light (anti)nuclei pairs deduced from their momentum correlation functions and system-size is self-consistent. Momentum correlation functions of nonidentical light nuclei pairs gated on velocity are applied to infer the average emission sequence of them. The results illustrate that protons are emitted in average on a similar time scale with neutrons but earlier than deuterons or tritons in the small relative momentum region. In addition, larger interval of the average emission order among them is exhibited for smaller collision systems or at more peripheral collisions.

    Comments:
    12 pages, 11 figures; Phys. Rev. C, accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2301.02846 [pdf]
    PRC(2023)·13 citations
  2. 11

    [Submitted on 7 Jan 2023] (cross-list from hep-ph)

    De Haas - van Alphen Effect under Rotation

    Shu-Yun Yang🇨🇳 · Ren-Da Dong🇨🇳 · Defu Hou🇨🇳 · Hai-Cang Ren🇨🇳

    We explored the interplay between magnetic field and rotation in the de Hass - van Alphen oscillation. The effect is found to be reduced because of the re-weighting of different states within the same Landau level by rotation energy. The implications of our results on high energy physics and condensed matter physics are speculated.

    Comments:
    21 pages, 9 figures in Revtex
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2301.02857 [pdf]
    PRD(2023)·5 citations
  3. 12

    [Submitted on 7 Jan 2023] (cross-list from physics.hist-ph)

    David Maurice Brink, 20 July 1930 - 8 March 2021

    C. V. Sukumar · A. Bonaccorso

    David Brink was one of the leading theoretical nuclear physicists of his generation. He made major contributions to the study of all aspects of nuclear physics embracing nuclear structure, nuclear scattering, and nuclear instability. His wide ranging interests and interactions with theorists and experimentalists alike helped him in providing both theoretical analysis and interpretations and suggesting experiments. He had the gift of visualising complex problems in simple terms and provided clear analysis of the underlying processes. He was an expert on the use of semi-classical methods which provided an intuitively clear picture of complex phenomena. His research work and books are characterised by scientific clarity, transparency, and depth. David possessed outstanding skills in mathematical computation, and he was an expert on special functions, group theory, and the Feynman path integral method. David had many research students and collaborated with a large number of scientists from across the world, for whom he was a source of scientific and human inspiration and admiration. His most fundamental belief was that research was a means of trying to discover and understand the beauties of Nature and explain them in simple terms to others. His absolute belief in the value of truth and his unselfish and generous attitude in sharing knowledge makes him an outstanding figure in contemporary Nuclear Physics.

    Comments:
    A slightly shortened version of this article was published in the Biographical Memoirs of Fellows of the Royal Society,Volume 73
    Subjects:
    History and Philosophy of Physics (physics.hist-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2301.02907 [pdf]
    Biographical Memoirs of Fellows of the Ro…·0 citations
  4. 13

    [Submitted on 8 Jan 2023] (cross-list from astro-ph.HE)

    Neutron stars in the context of (,) gravity

    Clésio E. Mota · Luis C. N. Santos · Franciele M. da Silva · Cesar V. Flores · Iarley P. Lobo · Valdir B. Bezerra

    In this work, we investigate the existence of neutron stars (NS) in the framework of (,) gravity, where is the torsion tensor and is the trace of the energy-momentum tensor. The hydrostatic equilibrium equations are obtained, however, with and quantities passed on by effective quantities and , whose mass-radius diagrams are obtained using modern equations of state (EoS) of nuclear matter derived from relativistic mean field models and compared with the ones computed by the Tolman-Oppenheimer-Volkoff (TOV) equations. Substantial changes in the mass-radius profiles of NS are obtained even for small changes in the free parameter of this modified theory. The results indicate that the use of (,) gravity in the study of NS provides good results for the masses and radii of some important astrophysical objects, as for example, the low-mass X-ray binary (LMXB) NGC 6397 and the pulsar of millisecond PSR J0740+6620. In addition, radii results inferred from the Lead Radius EXperiment (PREX-2) can also be described for certain parameter values.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2301.03067 [pdf]
    Universe(2023)·8 citations
  5. 14

    [Submitted on 8 Jan 2023] (cross-list from hep-ph)

    Synergy between NP and HEP research goals and efforts in fundamental symmetries and interactions

    Tanmoy Bhattacharya🇺🇸 · Rajan Gupta🇺🇸 · Kate Scholberg🇺🇸

    The aim of this white paper is to highlight several areas for which the Department of Energy's Office of Nuclear Physics has primary stewardship or significant investment and expertise, and for which there is also significant interest and expertise within the HEP community. These areas of overlap offer exciting opportunities for collaboration.

    Comments:
    8 pages. White paper submitted to the Nuclear Physics town hall meeting on Fundamental Symmetries as part of the Long Range Planning
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2301.03086 [pdf]
    0 citations
  6. 15

    [Submitted on 9 Jan 2023] (cross-list from hep-th)

    Popcorn transitions and approach to conformality in homogeneous holographic nuclear matter

    Jesús Cruz Rojas🇰🇷 · Tuna Demircik🇵🇱 · Matti Järvinen🇰🇷

    We study cold and dense nuclear matter by using the gauge/gravity duality. To this end we use the Witten-Sakai-Sugimoto model and the V-QCD models with an approach where the nuclear matter is taken to be spatially homogeneous. We focus on the ''popcorn'' transitions, which are phase transitions in the nuclear matter phases induced by changes in the layer structure of the configuration on the gravity side. We demonstrate that the equation of state for the homogeneous nuclear matter becomes approximately conformal at high densities, and compare our results to other approaches.

    Comments:
    15 pages, 5 figures
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2301.03173 [pdf]
    Symmetry(2023)·13 citations
  7. 16

    [Submitted on 9 Jan 2023] (cross-list from gr-qc)

    Quasi-equilibrium configurations of binary systems of dark matter admixed neutron stars

    Hannes R. Rüter · Violetta Sagun · Wolfgang Tichy · Tim Dietrich

    Using an adapted version of the SGRID code, we construct for the first time consistent quasi-equilibrium configurations for a binary system consisting of two neutron stars in which each is admixed with dark matter. The stars are modelled as a system of two non-interacting fluids minimally coupled to gravity. For the fluid representing baryonic matter the SLy equation of state is used, whereas the second fluid, which corresponds to dark matter, is described using the equation of state of a degenerate Fermi gas. We consider two different scenarios for the distribution of the dark matter. In the first scenario the dark matter is confined to the core of the star, whereas in the second scenario the dark matter extends beyond the surface of the baryonic matter, forming a halo around the baryonic star. The presence of dark matter alters the star's reaction to the companion's tidal forces, which we investigate in terms of the coordinate deformation and mass shedding parameters. The constructed quasi-equilibrium configurations mark the first step towards consistent numerical-relativity simulations of dark matter admixed neutron star binaries.

    Comments:
    13 pages, 11 figures, v2: Added investigation of dependence on dark matter particle mass
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2301.03568 [pdf]
    PRD(2023)·36 citations

Affiliations

first authorsco-authorsvia INSPIRE