Nuclear Theory·nucl-th

Wednesday·March 25, 2026

10 papers—6 primary·4 cross-listed

07
Analyzing Fermionic Dark Matter scenarios with anomalous compact objects
Yaiza Cano🇪🇸 · Jose Manuel Alarcón🇪🇸
In this paper, we consider three compact objects (HESS J1731-347, PSR J1231-1411, XTE J1814-338) with anomalous mass-radius relation to analyze the possibility of being dark matter admixed neutron stars. We try to infer the dark matter particle properties, under the assumption of behaving as a free Fermi gas. The main novelty relies on the use of a baryonic equation of state obtained from first principles in the whole density range, that allows to eliminate the model dependence of the baryonic part of the calculation. Once the possible Dark Matter Admixed Neutron Star configurations are obtained, we check their stability and whether it is feasible for a Neutron Star to capture the necessary dark matter fraction. We show that two of the anomalous compact objects (HESS J1731-347 and PSR J1231-1411) can be explained with a small fraction of fermionic dark matter content in the star. The other compact object (XTE J1814-338) cannot be explained as a dark matter admixed neutron star, and becomes a potential candidate for a twin star.
↳ hep-phastro-ph.HEnucl-th2 citations
08
Structure of QC $_{2}$ D ground state fields at nonzero matter densities
Ragib F. Hasan🇦🇺 · Matthew Cummins🇦🇺 · Waseem Kamleh🇦🇺 · Dale Lawlor🇮🇪 · Derek Leinweber🇦🇺 · Ian van Schalkwyk🇦🇺 · Jon-Ivar Skullerud🇮🇪
A quantitative investigation into the modification of ground-state field structures in two-color QCD (QC $_{2}$ D) is presented at finite chemical potential. Using lattice simulations with Wilson gauge and fermion actions, we explore the chromo-electromagnetic field strengths under varying matter densities. To ensure accurate measurements, we develop and calibrate two highly improved topological charge operators and evaluate four gradient flow actions. Our results reveal a finite-volume crossover in the regime of the anticipated phase boundary at $μ = m_{π} /2$ , with both chromo-electric and chromo-magnetic field strengths suppressed before recovering and exceeding vacuum values at higher chemical potentials. We find the difference between the squared chromo-electric and chromo-magnetic field strengths, $E^{2} - B^{2}$ , to increase in magnitude monotonically with increasing chemical potential. At $a μ = 0.7$ , we find an $11%$ suppression of $E^{2}$ , a relatively small effect. A systematic analysis using sigmoid fits of lattice simulations in the crossover regime is performed to confirm the critical chemical potential obtained from the field structure is in agreement with the phase boundary at $m_{π} /2$ . These findings provide new insight into non-Abelian ground-state vacuum field structures and offer a foundation for future studies in real QCD.
↳ hep-lathep-phnucl-th1 citation
09
Finite-nuclear-size effect for hydrogenlike ions under high external pressure
Dengshan Liu · Huihui Xie · Pengxiang Du · Tianshuai Shang · Jian Li · Jiguang Li · Tomoya Naito
The influence of pressure on finite-nuclear-size corrections to atomic energy levels and electron-capture decay rate is investigated in confined hydrogenlike ions. The ions are modeled inside an impenetrable spherical cavity, with a Gaussian distribution used to represent the nuclear charge distribution. For each confinement radius used to simulate external pressure, the energies and wave functions of the lowest-lying bound states are determined by numerically solving the Dirac equation via the kinetically balanced generalized pseudospectral method. In contrast to unconfined ions, both the FNS corrections and electron-capture decay rates increase markedly under pressure and exhibit parallel trends with increasing confinement. Pressure also removes level degeneracies and alters the relative magnitudes of FNS corrections across different bound states. Moreover, the nuclear charge radius is found to significantly affect the pressure-enhanced electron-capture decay rate.
↳ physics.atom-phnucl-thCommun.Theor.Phys.(2026)·0 citations
10
Unified description of Sivers and Boer-Mulders asymmetries from twist-3 correlations
Zhimin Zhu · Jiangshan Lan · Chandan Mondal · Xingbo Zhao · James P. Vary · BLFQ Collaboration
We present the first calculation of the Efremov-Teryaev-Qiu-Sterman functions and associated twist-3 quark-gluon correlation functions for both the proton and pion. These functions are determined using the light-front wave functions obtained by diagonalizing a light-front effective Hamiltonian within a Fock space truncated to include a dynamical gluon. We compute the twist-3 correlations in the hard-pole region and extrapolate them to the soft-gluon pole limit. After the scale evolutions, our predictions demonstrate quantitative consistency with recent experimental extractions, providing a unified description of the Sivers and Boer-Mulders asymmetries from a light-front Hamiltonian approach.
↳ hep-phhep-thnucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Analyzing Fermionic Dark Matter scenarios with anomalous compact objects

Structure of QC2​D ground state fields at nonzero matter densities

Finite-nuclear-size effect for hydrogenlike ions under high external pressure

Unified description of Sivers and Boer-Mulders asymmetries from twist-3 correlations

Affiliations

Structure of QC $_{2}$ D ground state fields at nonzero matter densities