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Nuclear Theory·nucl-th

Monday·February 23, 2026

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 05

    Higher order quantization conditions for two-body scattering with spin

    Lucas Chandler🇺🇸 · Frank X. Lee🇺🇸 · Andrei Alexandru🇺🇸

    We examine the Lüscher quantization condition to high order for the scattering of a spinless particle and a spin-1/2 particle in a periodic box. First, we derive the quantization conditions in a non-relativistic framework up to total angular momentum in both cubic and elongated geometries, and for both rest and moving frames. Then, we introduce a method to transparently cross-check their convergence, using both quantized energy levels in the box and infinite-volume phase shifts for the same potential. We clarify how to incorporate spin-orbit coupling into the formalism and show in detail how the quantization conditions converge order by order in the various irreducible representations. In all, we validated 19 quantization conditions (12 in cubic box, 7 in elongated box). This is a necessary step in applying the method in precision studies of systems in finite volume with half-integer spin, such as meson-baryon scattering.

    ↳ hep-lathep-phnucl-thPRD(2026)·0 citations
  2. 06

    Observation of Robust and Coherent Non-Abelian Hadron Dynamics on Noisy Quantum Processors

    Fran Ilčić🇮🇳 · Ritajit Majumdar🇮🇳 · Emil Mathew🇮🇳 · Md. Osama Ali🇮🇳 · Nathan Earnest-Noble🇺🇸 · Indrakshi Raychowdhury🇮🇳

    The real-time evolution of strongly interacting matter remains a frontier of fundamental physics, as classical simulations are hampered by exponential Hilbert space growth and rapid, unmanageable growth of quantum entanglement. This study reports the quantum simulation of hadron dynamics within a -dimensional SU(2) lattice gauge theory using a 156-qubit IBM superconducting processor. Leveraging a hardware-efficient Loop-String-Hadron (LSH) encoding, we simulate the dynamics of the physical degrees of freedom on a -site lattice in the weak-coupling regime, as a crucial step toward the continuum limit. The hardware data reveal confined meson propagation and early-time oscillations of the mesonic profile, from which we extract a breathing-mode frequency as a spectroscopic observable. Benchmarking against tensor-network simulations of the full LSH Hamiltonian and Pauli-propagation simulations of the noiseless circuit supports the validity of the physical approximation, the quantum algorithm and the observed dynamics within the accessible time window. These results show that physics-native encodings can enable scalable access to coherent non-Abelian real-time dynamics on noisy quantum hardware.

    ↳ hep-latcond-mat.str-elhep-thnucl-th+115 citations
  3. 07

    The hyperfine interaction as a probe of the microscopic structure of the atomic nucleus

    Denis Janković🇰🇷 · Jean-Gabriel Hartmann🇫🇷 · Johann Bartel🇫🇷 · Hervé Molique🇫🇷 · Ludovic Bonneau🇫🇷 · Paul-Antoine Hervieux🇫🇷

    The study of highly charged electronic and muonic hydrogen-like ions, provides an intriguing way to probe the internal structure of their atomic nuclei. In this work, we use nuclear structure calculations to accurately calculate the hyperfine splitting of electronic and muonic hydrogen-like ions, focusing in particular on the incorporation of finite-volume corrections, such as Bohr-Weisskopf and Breit-Rosenthal, due to the penetration of the electron and muon wavefunction into the nuclear electric charge and magnetic dipole densities. These corrections are essential for refining our understanding of the nuclear magnetic dipole and electric quadrupole moments. Our simulations use a Skyrme-Hartree-Fock-BCS model known for its effectiveness in modeling well-deformed nuclei such as and , with particular emphasis on isotopes. It can also be generalised to multi-electron ions by studying the hyperfine anomaly between two isotopes.

    ↳ physics.atom-phnucl-thquant-ph0 citations
  4. 08

    Quark-meson diquark model and color superconductivity in dense quark matter

    Jens O. Andersen🇳🇴 · Mathias P. Nødtvedt🇳🇴

    We consider the two- and three-flavor QMD models as renormalizable low-energy models for QCD at finite quark chemical potentials with quarks, mesons, and diquarks as effective degrees of freedom. Using the on-shell scheme the parameters in the scalar sector can be fixed and expressed in terms of observed meson masses and decay constants. The remaining parameters can be varied. In the QMD models, all the symmetries are global, including the symmetry. The breaking of the global symmetries gives rise to a number of Goldstone bosons depending on the symmetry-breaking pattern, i.e. whether the system is in the 2SC phase or the color-flavor-locked (CFL) phase. This is in contrast to perturbative QCD, where some of the gauge bosons become massive via the Higgs mechanism. We classify the Goldstone bosons and show that their type and number are in accordance with general counting rules. The thermodynamic potential is calculated in the mean-field approximation, where we include quark loops, while mesons and diquarks are treated at tree level. As important applications, we study the properties of the pion-condensed phase at finite isospin chemical potential, and the 2SC and CFL phases at finite baryon chemical potential. We present a few numerical results focusing on the speed of sound, gaps, and condensates. It is shown that the BCS gaps approaches a constant for large isospin and baryon chemical potentials and that the speed of sound approaches the conformal value from above in the same limit.

    ↳ hep-phhep-latnucl-th4 citations
  5. 09

    On self-dualities for scalar theory

    Paul Romatschke🇦🇹

    Scalar field theory is studied by constructing interacting saddle point expansions in the symmetric and broken phase, respectively. Focusing on analytically tractable saddle expansions, it is found that broken and symmetric phases are related by sign flip of the quartic coupling. Applications to dimensions recover previous results for the phase diagram, whereas is possibly new.

    ↳ hep-thcond-mat.quant-gasnucl-th3 citations

Affiliations

first authorsco-authorsvia INSPIRE