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Nuclear Theory·nucl-th

Friday·February 14, 2025

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    Revisiting Gauge Ambiguities for DUNE Precision

    Joshua Isaacson🇺🇸

    The de Forest prescription for handling off-shell initial states in the impulse approximation for lepton-nucleus scattering breaks gauge invariance. We discuss existing methods to address this problem and handle the form factor scale ambiguity. We demonstrate that the irreducible differences between the prescriptions are significant compared to the precision expected of next-generation accelerator neutrino experiments. A novel approach directly using the off-shell currents is proposed as a systematically improvable alternative.

    ↳ hep-phhep-exnucl-th1 citation
  2. 07

    Internal color contributions to flux tube entanglement entropy

    Rocco Amorosso🇺🇸 · Sergey Syritsyn🇺🇸 · Raju Venugopalan🇺🇸

    In recent work arXiv:2410.00112, we introduced and computed entanglement entropy of the color flux tube (FTE) between a heavy quark-antiquark pair in (2+1)D Yang-Mills theory. Our numerical results suggest that FTE can be partitioned into a component corresponding to transverse vibrations of the flux tube and an internal color entropy. Further, motivated by analytical (1+1)D calculations, and SU(2) (2+1)D Yang-Mills numerical results, we argued that the internal entropy takes the form , with the number of times, on average, that the flux tube crossed a boundary between region and its complement. We extend here our FTE study to consider different geometries of region , varying the number of boundary crossings, and number of colors. Our preliminary results support the conjectured form of the internal entropy, albeit with noteworthy subtleties relating to the partial/full intersections of the flux tube with the region .

    ↳ hep-lathep-phhep-thnucl-thPoS(2025)·4 citations
  3. 08

    PSR J1231-1411 revisited: Pulse Profile Analysis of X-ray Observation

    Liqiang Qi · Shijie Zheng · Juan Zhang · Mingyu Ge · Ang Li · Shuang-Nan Zhang · Fang-Jun Lu · Han-Long Peng · Liang Zhang · Hua Feng · Zhen Zhang · Yupeng Xu and 5 other authors

    One of the primary goals of Neutron Star Interior Composition Explorer (NICER)-like X-ray missions is to impose stringent constraints on the neutron star equation of state by precisely measuring their masses and radii. NICER has recently expanded the dataset of inferred mass-radius relations for neutron stars, including four rotation-powered millisecond pulsars PSR J0030+0451, PSR J0740+6620, PSR J0437-4715, and PSR J1231-1411. In this work, the mass-radius relation and X-ray emitting region properties of PSR J1231-1411 are inferred with an independent pulse profile modeling based on the spherical star Schwarzschild-spacetime and Doppler approximation. With one single-temperature elongated hot spot and one single-temperature crescent hot spot, the inferred gravitational mass is and the inferred equatorial radius is km (68% credible intervals). It provides an alternative geometry configuration of the X-ray emitting region for PSR J1231-1411 to sufficiently explain the observation data of NICER and XMM-Newton. The inferred radius is smaller than that derived by \citet{salmi2024nicer} (, km), and the inferred mass is slightly higher in this work. The inferred geometry configurations of the X-ray emitting region in both works are non-antipodal, which is not consistent with a centered dipole magnetic field and suggests a complex magnetic field structure.

    ↳ astro-ph.HEnucl-thApJ(2025)·26 citations
  4. 09

    PSR J0952-0607: Probing the Stiffest Equations of State and r-Mode Suppression Mechanisms

    Zeyue Wu · Bhaskar Biswas · Stephan Rosswog

    We analyze PSR J0952-0607, the most massive and fastest spinning neutron star observed to date, to refine constraints on the neutron star equation of state (EoS) and investigate its robustness against r-mode instabilities. With a mass of \( 2.35 \pm 0.17 \, M_{\odot} \) and a spin frequency of 709.2 Hz, PSR J0952-0607 provides a unique opportunity to examine the effects of rapid rotation on the structure of a neutron star. Using a Bayesian framework, we incorporate the rotationally corrected mass of PSR J0952-0607, alongside PSR J0740+6620's static mass measurement, to constrain the EoS. Our findings demonstrate that neglecting rotational effects leads to biases in the inferred EoS, while including the neutron star spin produces tighter constraints on pressure-density and mass-radius relations. Additionally, we explore the r-mode instability window for PSR J0952-0607 under the assumption of both rigid and elastic crust models and find that a rigid crust allows a higher stable temperature range, whereas an elastic crust places the star within the instability window under certain thermal insulation conditions.

    ↳ astro-ph.HEgr-qcnucl-th5 citations

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