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Nuclear Theory·nucl-th

Thursday·May 14, 2026

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 11 May 2026]

    Spin dynamics and polarization in relativistic systems: recent developments

    Sourav Dey🇮🇳 · Arpan Das🇮🇳 · Hiranmaya Mishra🇮🇳 · Amaresh Jaiswal🇮🇳

    We review recent theoretical and experimental developments in spin dynamics and polarization phenomena in relativistic systems, with a particular focus on heavy-ion collisions. The large angular momentum and magnetic field generated in non-central collisions induce vorticity in the quark-gluon plasma, leading to observable spin polarization of emitted hadrons. We discuss the theoretical foundations of spin polarization arising from spin-vorticity coupling, including formulations based on relativistic hydrodynamics, kinetic theory, and quantum statistical approaches such as the Zubarev density operator. A central theme of the review is the role of pseudo-gauge freedom and its implications for defining energy-momentum and spin tensors, which can influence theoretical predictions of polarization observables. We further examine different formulations of spin hydrodynamics, emphasizing the impact of gradient expansions, spin chemical potential, and entropy-current analysis on the structure of the theory and associated transport coefficients. In addition, we discuss the recent developments in heavy flavor spin dynamics within the framework of rotational Brownian motion, where spin degrees of freedom undergo stochastic evolution due to interactions with the medium. This framework provides a complementary perspective on spin relaxation and diffusion by incorporating the effects of strong initial magnetic fields and establishes connections between spin polarization and the initial geometry through the definition of polarization harmonics. This review provides a comprehensive overview of relativistic spin hydrodynamics as well as non-equilibrium spin dynamics, and outlines future directions toward a consistent and predictive description of spin phenomena in strongly interacting matter.

    Comments:
    60 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2605.12554 [pdf]
    2 citations
  2. 02

    [Submitted on 13 May 2026]

    Anomalous large-angle -scattering in a single-folding model with microscopic densities

    A. -G. Serban · F. Salvat-Pujol · N. Sandulescu · P. Marević

    We investigate anomalous large-angle scattering (ALAS) of -particles from nuclei within the framework of the single-folding model. Differential cross sections are calculated by folding the -nucleon interaction with nuclear density distributions obtained from both relativistic and non-relativistic mean-field models. The folding procedure employs a Gaussian-form -nucleon interaction, with its energy dependence and range constrained by previous theoretical studies. Our results show that ALAS in -shell nuclei is reasonably well reproduced using the microscopic densities together with an -nucleon interaction characterized by a unified parameter set, in which only two parameters vary with the mass number.

    Comments:
    23 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2605.13356 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE