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Nuclear Theory·nucl-th

Monday·July 13, 2026

18 papers—11 primary·7 cross-listed

All18Primary11Cross-lists7
  1. 12

    [Submitted on 10 Jul 2026] (cross-list from astro-ph.HE)

    Effects of Differential Rotation on the Maximum Mass of Neutron Stars

    Hyukjin Kwon🇯🇵 · Jinho Kim🇰🇷 · Kazuyuki Sekizawa🇯🇵

    The maximum mass of neutron stars provides a key constraint on the equation of state (EoS) of dense matter. Recent observations, including the pulsar PSR~J0740+6620, have placed strong constraints on a large class of soft EoSs, while the possible existence of a compact object with a mass of - in GW 190814 further challenges our understanding of dense matter. Moreover, the inclusion of hyperonic degrees of freedom generally softens the EoS, making it difficult to support massive neutron stars even when the constraint is satisfied (a problem known as the hyperon puzzle). In this work, we investigate whether differential rotation can enhance the maximum mass of neutron stars constructed with an EoS including hyperons, thereby addressing the maximum-mass constraints imposed by current observations. We employ the Cook-Shapiro-Teukolsky (CST) approach, a numerically improved reformulation of the Komatsu-Eriguchi-Hachisu (KEH) scheme, to construct equilibrium configurations of differentially rotating neutron stars. For the nuclear matter EoS, we adopt a relativistic mean-field (RMF) model incorporating hyperonic degrees of freedom through an SU(6) symmetric coupling scheme. We find that differential rotation can substantially increase the maximum mass, yielding configurations consistent with the mass range inferred from GW 190814. However, a sufficiently soft EoS fails to satisfy the constraint from PSR~J0740+6620 (346 Hz) even with differential rotation applied. We also present a systematic analysis of the internal structure of the resulting equilibrium configurations. Furthermore, we demonstrate the existence of quasi-toroidal configurations and present equilibrium sequences incorporating the full baryon octet under extreme differential rotation.

    Comments:
    17 pages, 11 figures, 4 tables, Submitted to Physical Review D
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2607.09040 [pdf]
    0 citations
  2. 13

    [Submitted on 10 Jul 2026] (cross-list from gr-qc)

    Influence of chemical potential to explain the maximum mass and tidal love number of strange stars

    Debadri Bhattacharjee🇮🇳 · Pradip Kumar Chattopadhyay🇮🇳

    We investigate the influence of medium effects on strange quark matter and their consequences for the structural properties of compact stars. In this study, the bag constant, in the MIT bag model equation of state, is reformulated as a function of the chemical potential of quark. Imposing the Bodmer-Witten stability criterion, the parameter space is constrained by evaluating the energy per baryon. The Tolman-Oppenheimer-Volkoff equations are then solved to obtain the maximum mass-radius configurations. Our analysis shows that an increase in chemical potential leads to a reduction in the effective value of bag constant, resulting in a stiffer equation of state and correspondingly higher value of maximum stellar mass. Furthermore, we examine the chemical potential dependence of the tidal Love number and tidal deformability. The results demonstrate that, for the chosen set of parameters, the constraint from the GW170817 event, namely , is consistently satisfied. In this paper, we have tried to establish how chemical potential affects the maximum mass and tidal deformability of strange stars.

    Comments:
    14 pages, 9 figures
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2607.09120 [pdf]
    0 citations
  3. 14

    [Submitted on 10 Jul 2026] (cross-list from hep-ph)

    Tensor-polarized parton distribution functions of the deuteron by a convolution model

    S. Kumano🇨🇳 · Kenshi Kuroki🇨🇳

    Tensor-polarized parton distribution functions (PDFs) are calculated for the deuteron by using a convolution formalism, where the tensor-polarized PDFs are given by the corresponding nucleon's unpolarized PDFs convoluted with the tensor-polarized nucleon momentum distribution in the deuteron. These distributions are obtained at GeV in order to compare with the tensor-polarized PDFs which were determined by HERMES data. The obtained distributions are very different from the ones determined from the HERMES data, which indicates further studies are needed to clarify the difference, possibly by considering a new mechanism beyond the simple bound system of a proton and a neutron. The obtained PDFs and are converted to the PDFs of the Trento convention and , and they are used for estimating the twist-3 PDFs and by using a Wandzura-Wilczek-like relation. Because deep-inelastic-scattering experiments are under preparation for structure functions with a tensor-polarized deuteron target at the Thomas Jefferson National Accelerator Facility, and a Drell-Yan experiment will be possible at hadron accelerator facilities, such as the Fermi National Accelerator Laboratory, the obtained tensor-polarized PDFs will be tested experimentally.

    Comments:
    7 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2607.09237 [pdf]
    0 citations
  4. 15

    [Submitted on 10 Jul 2026] (cross-list from hep-ph)

    Diffusion Monte Carlo study of deuteron-like fully light hexaquarks

    M.C. Gordillo🇪🇸 · J. Segovia🇪🇸

    We perform a Diffusion Monte Carlo study of fully light hexaquark containing three quarks and three quarks within a constituent-quark model. Both compact and baryon--baryon-like arrangements were considered separately. All compact hexaquark configurations are found well above their corresponding baryon--baryon thresholds, suggesting that deeply bound compact six-quark states are not favored in the light-quark sector within this model. By contrast, several dibaryon-like configurations lie close, but above, to the , , and thresholds and show spatial structures compatible with molecular states. One configuration exhibits two well-defined nucleon-like subclusters separated by several femtometers, closely resembling the spatial structure of the deuteron, although its calculated energy remains slightly above the corresponding threshold.

    Comments:
    5 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2607.09288 [pdf]
    0 citations
  5. 16

    [Submitted on 10 Jul 2026] (cross-list from hep-ph)

    Running coupling effects in the anti-collinear resummation in high energy evolution

    Alex Kovner🇺🇸 · Michael Lublinsky🇮🇱 · Maxim Nefedov🇮🇱 · Vladimir Skokov🇺🇸

    We study the effects of the running of the QCD coupling on the anti-collinear resummation in JIMWLK evolution in the linear (BFKL) regime. We determine the appropriate scale choice for the coupling entering the JIMWLK kernel, and derive the anti-collinearly resummed BFKL kernel, which includes running-coupling effects both in the resummation equation (i.e. DGLAP) and in the JIMWLK kernel proper. We find that the running of the coupling generally further slows down BFKL evolution, as expected. Surprisingly however the value of the generalized characteristic function at is unaffected by the running coupling owing to subtle cancellations. We develop an approximation that allows us to use the generalized characteristic function to study the BFKL Green's function. Within this approximation we find that the Pomeron intercept in the anti-collinear regime is significantly reduced by both, the resummation and the running of the coupling.

    Comments:
    46 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2607.09337 [pdf]
    0 citations
  6. 17

    [Submitted on 10 Jul 2026] (cross-list from astro-ph.HE)

    Neutron contribution to the force on a proton vortex in superconducting neutron-star matter

    Oleg A. Goglichidze · Mikhail E. Gusakov

    We investigate the forces acting on a proton vortex in superconducting neutron-star matter composed of neutrons, protons, and electrons, accounting for Fermi-liquid interactions in the neutron-proton subsystem. While the force arising from electron scattering by the vortex magnetic field is well known, we demonstrate that normal neutrons also exert a force on proton vortices due to Fermi-liquid coupling with superconducting protons. Using a kinetic approach based on Landau Fermi-liquid theory, we show that neutron quasiparticles scatter off a proton vortex through the spatially varying condensate momentum, giving rise to a longitudinal force proportional to the relative neutron-vortex velocity. In contrast to the electron contribution, this force has no transverse component and vanishes in the absence of neutron-proton Fermi-liquid interaction. Within a simple model, we analyze the main properties of this force and provide physically motivated estimates of its magnitude.

    Comments:
    23 pages, 1 figure, accepted for publication in Phys. Rev. C
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    2607.09468 [pdf]
    PRC(2026)·0 citations
  7. 18

    [Submitted on 10 Jul 2026] (cross-list from nucl-ex)

    Beyond Sphericity in a Semi-Magic Nucleus: Multiple-Shape Coexistence in Sn

    Marco Siciliano🇺🇸 · Marco Rocchini🇮🇹 · Tomás R. Rodríguez🇪🇸 · Alain Goasduff🇮🇹 · Andres Illana🇮🇹 · Mansi Saxena🇺🇸 · Giacomo de Angelis🇮🇹 · Samuel Bakes🇮🇹 · Tuncay Bayram🇮🇹 · Dino Bazzacco🇮🇹 · Kevin Belvedere🇬🇧 · Giovanna Benzoni🇮🇹 and 34 other authors

    The study of nuclear shape evolution and coexistence provides key insight into the nuclear interaction, particularly in semi-magic systems expected to be spherical. A high-precision Coulomb-excitation measurement of Sn yields a comprehensive set of electromagnetic matrix elements, enabling the determination of quadrupole moments of the states and intrinsic deformations of the states. The results provide an unambiguous and direct proof of the rare phenomenon of multiple-shape coexistence, revealing a weakly deformed ground state incompatible with the spherical shape.

    Comments:
    7 pages, 4 figures, 1 table
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2607.09551 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE