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Nuclear Theory·nucl-th

Thursday·October 9, 2025

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 7 Oct 2025]

    Proper time expansions and glasma dynamics

    Margaret E Carrington🇨🇦 · Bryce T. Friesen🇨🇦 · Doug Pickering🇨🇦 · Shane Sangster🇨🇦 · Kaene Soopramania🇨🇦

    The earliest phase of an ultrarelativistic heavy ion collision can be described as a highly populated system of gluons called glasma. The system's dynamics is governed by the classical Yang-Mills equation. Solutions can be found at early times using a proper time expansion. Since the expansion parameter is the time, this method is necessarily limited to the study of early time dynamics. In addition compute time and memory limitations restrict practical calculations to no more than eighth order in the expansion. The result is that the method produces reliable results only for very early times. In this paper we explore several different methods to increase the maximum time that can be reached. We find that, depending slightly on the quantity being calculated, the latest time for which reliable results are obtained can be extended approximately 1.5 times (from ~fm/ using previous methods to about ~fm/).

    Comments:
    20 pages, 10 figures, published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.06390 [pdf]
    0 citations
  2. 02

    [Submitted on 8 Oct 2025]

    Excitation energy of fission fragments within nuclear time-dependent density functional theory

    Antonio Bjelčić🇺🇸 · Nicolas Schunck🇺🇸 · Marc Verriere🇺🇸

    The number and properties of the neutrons and photons emitted in nuclear fission are directly related to the excitation energy of the fission fragments when they are formed at scission. Though not observable experimentally because of the extremely short time scales, the excitation energy of fission fragments can be predicted by microscopic theory based on time-dependent density functional theory (TDDFT). Initial results on the value of the total kinetic energy of fission reactions were very promising, but could not probe all possible fragmentations. In this work, we perform large-scale TDDFT calculations in Pu enabled by the development of a new TDDFT solver. We obtain TDDFT trajectories covering nearly all possible fragmentations. We find that the total kinetic energy is close to experimental values only for the most likely fission while it is severely underestimated at both small and large asymmetries. This conclusion seems rather independent of the parameterization of the energy functional, both in its particle-hole and particle-particle channels.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.06701 [pdf]
    PRC(2026)·7 citations
  3. 03

    [Submitted on 8 Oct 2025]

    A Data-Guided Coalescence Model for Light Nuclei and Hypernuclei Production in Relativistic Heavy-Ion Collisions at --200 GeV

    Yue Hang Leung🇩🇪 · Yingjie Zhou🇩🇪 · Norbert Herrmann🇩🇪

    The production of light hypernuclei in relativistic heavy-ion collisions provides a unique opportunity to probe hyperon--nucleon interactions and possible three-body forces, which are central to the resolution of the hyperon puzzle in neutron star matter. In this work, we develop a data-guided coalescence framework in which the source size is extracted from proton and deuteron yields and used, together with measured proton and spectra, to predict the production of nuclei and hypernuclei in --200~GeV Au+Au collisions. For tritons, calculations with a Gaussian wave function reproduce experimental spectra and yield ratios across this energy range. For the hypertriton, the model predictions are highly sensitive to the assumed wave function. This sensitivity is strongest at low collision energies and in low-multiplicity environments, implying that such conditions are particularly valuable for probing hypernuclear structure.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.06758 [pdf]
    PRC(2026)·5 citations
  4. 04

    [Submitted on 8 Oct 2025]

    Scattering of charged particles within Efros method utilizing oscillator series expansion of wave functions

    Ustin M. Yanikov · Vasily A. Kulikov · Andrey M. Shirokov

    We apply the version of the Efros method utilizing oscillator expansion of wave functions to the Coulomb scattering problem using our recent developments of the HORSE formalism. The approach yields accurate phase shifts and cross sections with significantly reduced computational cost compared to the full HORSE method, while maintaining agreement with exact solutions. These results demonstrate the efficiency of the Efros method and its prospect for applications in ab initio nuclear reaction calculations.

    Comments:
    Preprint of an article submitted for consideration in International Journal of Modern Physics E o̧pyright} 2025 copyright World Scientific Publishing Company. https://www.worldscientific.com/worldscinet/ijmpe
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.06976 [pdf]
    IJMPE(2026)·0 citations
  5. 05

    [Submitted on 8 Oct 2025]

    Transport-based initial conditions for heavy-ion collisions at finite densities

    H. Roch🇺🇸 · G. Pihan🇺🇸 · A. Monnai🇯🇵 · S. Ryu🇺🇸 · N. Senthilkumar🇺🇸 · J. Staudenmaier🇩🇪 · H. Elfner🇩🇪 · B. Schenke🇺🇸 · J. H. Putschke🇺🇸 · C. Shen🇺🇸 · S. A. Bass🇺🇸 · M. Chartier🇬🇧 and 44 other authors

    We employ the SMASH transport model to provide event-by-event initial conditions for the energy-momentum tensor and conserved charge currents in hydrodynamic simulations of relativistic heavy-ion collisions. We study the fluctuations and dynamical evolution of three conserved charge currents (net baryon, net electric charges, and net strangeness) with a 4D lattice-QCD-based equation of state, NEOS-4D, in the hydrodynamic phase. Out-of-equilibrium corrections at the particlization are generalized to finite densities to ensure the conservation of energy, momentum, and the three types of charges. These theoretical developments are integrated within the X-SCAPE code as a unified framework for studying the nuclear matter properties in the Beam Energy Scan program.

    Comments:
    17 pages, 12 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2510.06996 [pdf]
    PRC(2026)·5 citations
  6. 06

    [Submitted on 8 Oct 2025]

    A method to obtain bounds on the equation of state of cold nuclear matter from imaginary chemical potentials

    Thomas D. Cohen🇺🇸

    The sign problem in numerical calculations of the QCD Euclidean space path integral of QCD with a chemical potential vanishes if the chemical potential is imaginary. Moreover, calculations of the partition function with imaginary chemical potentials are equivalent to calculations with Lagrange multipliers enforcing the current density. At zero temperature, Lorentz boosts allow one to deduce properties of systems with both number density and current density from properties of systems with a current density alone; this allows both upper and lower bounds to be determined for the equation of state (EOS) in the form of energy density as a function of number density.

    Comments:
    The title has been updated to make clear that this paper proposes a method for obtaining bounds rather than directly obtaining bounds. A number of typos have been corrected and some modest editorial changes have been made to enhance readability
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat)
    arXiv:
    2510.07124 [pdf]
    PRL(2026)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE