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Nuclear Theory·nucl-th

Monday·September 19, 2022

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 15 Sept 2022]

    Equation of State and Energy Loss of Hot and Dense Quark-Gluon matter from Holographic Black Holes

    Joaquin Grefa🇺🇸 · Mauricio Hippert🇺🇸 · Jorge Noronha🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Israel Portillo🇺🇸 · Claudia Ratti🇺🇸 · Romulo Rougemont🇧🇷

    By using gravity/gauge correspondence, we construct a holographic model, constrained to mimic the lattice QCD equation of state at zero density, to investigate the temperature and baryon chemical potential dependence of the equation of state. We also obtained the energy loss of light and heavy partons within the hot and dense plasma represented by the heavy quark drag force, Langevin diffusion coefficients and jet quenching parameter at the critical point and across the first-order transition line predicted by the model.

    Comments:
    4 pages, proceedings for the 20th International Conference on Strangeness in Quark Matter (SQM2022)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    2209.07643 [pdf]
    EPJ Web Conf.(2023)·0 citations
  2. 02

    [Submitted on 16 Sept 2022]

    Finite particle-number description of symmetric nuclear matter with spin excitations of high-momentum pairs induced by tensor force

    Niu Wan · Takayuki Myo · Hiroki Takemoto · Hiroshi Toki · Chang Xu · Hisashi Horiuchi · Masahiro Isaka · Mengjiao Lyu · Qing Zhao

    We study the symmetric nuclear matter using bare nucleon-nucleon () interactions with finite particle-number approach within finite cubic boxes. Due to the correlations originating from bare interaction, two nucleons can be excited to the high-momentum region, leading to the increase of the kinetic energy in nuclear matter. We further consider the spin excitations in the nucleon pairs, where the spin of the two nucleons are changed, and this excitation is important for the tensor correlation. The unitary correlation operator method (UCOM) is used to treat the short-range correlation. The tail correction coming from the neighbouring boxes is also included. We demonstrate the contributions of various excitations of nucleon pairs as well as the tail correction to the total energy at the normal density. We also discuss the effects of UCOM and correlated nucleon pairs on the density dependence of the total energy. We calculate the equations of state of symmetric nuclear matter using two kinds of the Argonne potentials and the results agree with those from other many-body theories. The density dependences of the Hamiltonian components are also shown.

    Comments:
    12 pages, 11figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2209.07810 [pdf]
    PRC(2022)·1 citation
  3. 03

    [Submitted on 16 Sept 2022] (cross-list from quant-ph)

    Variance minimisation on a quantum computer for nuclear structure

    Isaac Hobday🇬🇧 · Paul Stevenson🇬🇧 · James Benstead🇬🇧

    Quantum computing opens up new possibilities for the simulation of many-body nuclear systems. As the number of particles in a many-body system increases, the size of the space if the associated Hamiltonian increases exponentially. This presents a challenge when performing calculations on large systems when using classical computing methods. By using a quantum computer, one may be able to overcome this difficulty thanks to the exponential way the Hilbert space of a quantum computer grows with the number of quantum bits (qubits). Our aim is to develop quantum computing algorithms which can reproduce and predict nuclear structure such as level schemes and level densities. As a sample Hamiltonian, we use the Lipkin-Meshkov-Glick model. We use an efficient encoding of the Hamiltonian onto many-qubit systems, and have developed an algorithm allowing the full excitation spectrum of a nucleus to be determined with a variational algorithm capable of implementation on today's quantum computers with a limited number of qubits. Our algorithm uses the variance of the Hamiltonian, , as a cost function for the widely-used variational quantum eigensolver (VQE). In this work we present a variance based method of finding the excited state spectrum of a small nuclear system using a quantum computer, using a reduced-qubit encoding method.

    Comments:
    3 Pages, Submitted as conference proceeding to Nuclear Data 2022
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    2209.07820 [pdf]
    6 citations
  4. 04

    [Submitted on 16 Sept 2022] (cross-list from hep-ph)

    Theory of Neutrino Physics -- Snowmass TF11 (aka NF08) Topical Group Report

    André de Gouvêa🇺🇸 · Irina Mocioiu🇺🇸 · Saori Pastore🇺🇸 · Louis E. Strigari🇺🇸 · L. Alvarez-Ruso🇪🇸 · A. M. Ankowski🇺🇸 · A. B. Balantekin🇺🇸 · V. Brdar🇺🇸 · M. Cadeddu🇮🇹 · S. Carey🇺🇸 · J. Carlson🇺🇸 · M.-C. Chen🇺🇸 and 35 other authors

    This is the report for the topical group Theory of Neutrino Physics (TF11/NF08) for Snowmass 2021. This report summarizes the progress in the field of theoretical neutrino physics in the past decade, the current status of the field, and the prospects for the upcoming decade.

    Comments:
    26 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2209.07983 [pdf]
    18 citations
  5. 05

    [Submitted on 16 Sept 2022] (cross-list from nucl-ex)

    Beam Energy Dependence of Triton Production and Yield Ratio () in Au+Au Collisions at RHIC

    STAR Collaboration: M. I. Abdulhamid🇪🇬 · B. E. Aboona🇺🇸 · J. Adam🇨🇿 · J. R. Adams · G. Agakishiev🇷🇺 · I. Aggarwal🇮🇳 · M. M. Aggarwal🇮🇳 · Z. Ahammed · A. Aitbaev🇷🇺 · I. Alekseev🇷🇺 · D. M. Anderson🇺🇸 · A. Aparin🇷🇺 and 345 other authors

    We report the triton () production in mid-rapidity ( 0.5) Au+Au collisions at = 7.7--200 GeV measured by the STAR experiment from the first phase of the beam energy scan at the Relativistic Heavy Ion Collider (RHIC). The nuclear compound yield ratio (), which is predicted to be sensitive to the fluctuation of local neutron density, is observed to decrease monotonically with increasing charged-particle multiplicity () and follows a scaling behavior. The dependence of the yield ratio is compared to calculations from coalescence and thermal models. Enhancements in the yield ratios relative to the coalescence baseline are observed in the 0\%-10\% most central collisions at 19.6 and 27 GeV, with a significance of 2.3 and 3.4, respectively, giving a combined significance of 4.1. The enhancements are not observed in peripheral collisions or model calculations without critical fluctuation, and decreases with a smaller acceptance. The physics implications of these results on the QCD phase structure and the production mechanism of light nuclei in heavy-ion collisions are discussed.

    Comments:
    6 pages, 4 figures, Supplemental Material: http://link.aps.org/supplemental/10.1103/PhysRevLett.130.202301
    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:
    2209.08058 [pdf]
    PRL(2023)·91 citations

Affiliations

first authorsco-authorsvia INSPIRE