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Nuclear Theory·nucl-th

Wednesday·September 24, 2025

12 papers—6 primary·6 cross-listed

All12Primary6Cross-lists6
  1. 01

    Charm quark evolution in the early stages of heavy-ion collisions

    Mayank Singh🇺🇸 · Manu Kurian🇮🇳 · Björn Schenke🇺🇸 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    Heavy quarks are predominantly generated at the initial stage of relativistic heavy-ion collisions such that heavy flavor observables have the potential to provide information on the pre-equilibrium medium dynamics. In this study, we investigate the sensitivity of D-meson and to early-time charm quark dynamics in Pb+Pb collisions at TeV. We employ the IP-Glasma+MUSIC+UrQMD framework to model the evolution of the bulk medium. Charm quarks are generated using PYTHIA with nuclear parton distribution functions and evolved using Langevin dynamics within MARTINI. We observe that even though there is significant momentum broadening in the earliest stage, D-meson and are only weakly sensitive to pre-equilibrium interactions.

    nucl-thhep-phPRC(2026)·9 citations
  2. 02

    Longitudinal collective modes in relativistic asymmetric magnetized nuclear matter within the covariant Vlasov approach

    Aziz Rabhi🇪🇸 · Olfa Boukari🇹🇳 · Sidney S. Avancini🇧🇷 · Constança Providência🇵🇹

    The neutron-proton-electron (npe) matter under strong magnetic field is studied in the context of the covariant Vlasov approach. A covariant relativistic approach based on the Vlasov equation is applied to the study of infinite asymmetric magnetized nuclear matter. We use several relativistic mean-field nuclear models with non-linear terms. The dispersion relations for the longitudinal modes are obtained, and the isovector and isoscalar collective modes are determined in a wide range of densities as a function of the isospin asymmetry, momentum transfer, and magnetic field. A strong magnetic field gives rise to the appearance of low-lying isovector modes that propagate in nuclear matter, not present in non-magnetized matter. Neutron-like modes are essentially not affected by the presence of a strong magnetic field. In the presence of a strong magnetic field, Landau quantization modifies the proton-like collective modes, leading to the emergence of new branches associated with distinct Landau levels. These new modes can propagate even at high densities and exhibit isoscalar or isovector character.

    nucl-thPRC(2026)·1 citation
  3. 03

    Magnetization by Rotation: Spin and Chiral Condensates in the NJL Model

    Lutz Kiefer🇩🇪 · Ashutosh Dash🇩🇪 · Dirk H. Rischke🇩🇪

    The role of spin degrees of freedom in the quark-gluon plasma (QGP) has attracted significant interest in recent years. Spin hydrodynamics extends conventional hydrodynamics by incorporating spin via the spin tensor. In the mean-field limit of the Nambu-Jona-Lasinio (NJL) model under rigid rotation, spin degrees of freedom manifest naturally as axial-vector, or spin, condensate. We investigate the interplay between chiral and spin condensates in this framework. While rotation typically suppresses the formation of a chiral condensate, the presence of a spin condensate may counteract this effect, enhancing the chiral condensate. Moreover, it can alter the nature of the chiral transition from second to first order.

    nucl-thhep-thPRD(2026)·3 citations
  4. 04

    Stochastic Mean-Field Theory and Applications to Multinucleon Transfer and Kinetic Energy Dissipation Processes in Heavy-Ion Collisions

    S. Ayik · M. Arik · O. Yilmaz · A.S. Umar

    In this Review article, a brief description of the stochastic mean-field theory (SMF) for describing reaction dynamics in low-energy heavy-ion collisions at bombarding energies in the vicinity of the Coulomb barrier is presented. In these collisions, as a result of strong Pauli blocking, binary nucleon collisions do not have a significant effect on the dissipation and fluctuations. At low energies, the mean-field fluctuations, due to initial correlations, have a dominant effect on fluctuations of macroscopic variables. The SMF theory proposes the determination of an ensemble of single-particle density matrices by specifying random initial fluctuations according to a distribution law. Employing an ensemble of single-particle density matrices, not only the mean values but also the distribution functions of the one-body observables can be determined. If the di-nuclear structure is maintained in heavy-ion collisions, such as deep inelastic collisions and fast quasi-fission reactions, a much simpler description of the reaction mechanism can be derived in terms of several macroscopic variables such as mass and charge asymmetry, and relative linear and relative angular momentum. In this case, by geometric projection of the SMF equations, it is possible to derive the quantal Langevin equations for macroscopic variables. As an application of quantal transport description, an analysis of multinucleon transfers and kinetic energy dissipation and fluctuations is presented for selected quasi-fission reactions.

    nucl-thEPJA(2026)·1 citation
  5. 05

    Fine-tuning of the and quasi-bound state calculations

    N.V. Shevchenko🇨🇿

    Fine-tuning of the binding energies and widths of the quasi-bound states in three-body systems consisting of antikaon(s) and nucleon(s) was performed. Dynamically exact three-body Faddeev-type AGS equations with three coupled particle channels were solved for the description of the and systems in different spin states. New models of the antikaon-nucleon and pion-nucleon interactions were constructed, and together with our best versions for the remaining potentials were used as input. The characteristics of the quasi-bound state calculated with our new one-pole potential reproduces the experimental data from the E15 J-PARC experiment.

    nucl-thPRC(2025)·4 citations
  6. 06

    A novel filtering method for generating desired density profiles of colliding nuclei

    Xilong Xiang🇨🇳 · Manzi Nan🇨🇳 · Pengcheng Li🇨🇳 · Yongjia Wang🇨🇳 · Ling Liu🇨🇳 · Qingfeng Li🇨🇳

    Accurate modeling of the density profile is essential for studying heavy-ion collisions (HICs) with a transport model. Within the framework of the quantum molecular dynamics (QMD)-type model, a novel method for generating desired nuclear density distributions based on Fourier series expansion is proposed. This new initialization method is further incorporated into the ultrarelativistic quantum molecular dynamics model, and the bubble-like density distribution of Ru is constructed. Then, by simulating Ru+Ru collisions at MeV/nucleon with different equations of state (EoS) and initialization methods, the effects of the initial density distribution on the final state observables and the constrained information of EoS are analyzed. It is found that Ru nuclei with a bubble density profile lead to an increased maximum compression during the collision, which in turn enhances the collective flow. Moreover, a relatively stiff EoS with MeV is favored for the conventional Woods-Saxon type density profile, whereas an EoS with =200-280 MeV is supported when a bubble-like density profile is employed. These results demonstrate that the initial nuclear density distribution plays a non-negligible role in dynamical observables and EoS constraints. The proposed method thus provides a powerful tool for constructing exotic profiles and investigating nuclear structure effects in HICs.

    nucl-thPRC(2026)·1 citation

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first authorsco-authorsvia INSPIRE