Nuclear Theory·nucl-th

Friday·July 24, 2026

10 papers—5 primary·5 cross-listed

06
[Submitted on 22 Jul 2026] (cross-list from astro-ph.HE)
Reaction-constrained composition $g$-modes in neutron stars with antikaon condensates, hyperons, and $\Delta(1232)$ resonances
Prashant Thakur🇰🇷 · Ishfaq Ahmad Rather🇩🇪
We study core composition $g_1$ modes of cold, nonrotating neutron stars containing antikaon condensates, hyperons, and $\Delta(1232)$ baryons and present, to our knowledge, the first calculation in full general relativity of the continuous-composition $g_1$-mode frequency and gravitational-wave damping time for stars with a $K^-$ condensate. Using the BigApple relativistic mean-field equation of state, we compute frequencies, damping times, and frozen-composition tidal overlaps, and identify the buoyancy channels with a species-resolved Ledoux decomposition validated by mode-frequency sensitivities. We compare fully frozen matter with a fast-$K$ limit for $n\leftrightarrow p+K^-$ and a strong-equilibrium limit for the $\Delta$ quartet. Fast-$K$ equilibration retains $36\%$--$44\%$ of the peak local kaon buoyancy and $65.7\%$--$73.4\%$ of the frozen terminal-configuration frequencies, while increasing the damping times by factors of $14.4$--$31.8$; the mode remains above the nucleonic band. Strong $\Delta$ equilibration removes most of the direct $\Delta$-induced enhancement, returning the $N\Delta$ mode toward the nucleonic band, whereas the high-frequency $NY\Delta$ branch survives through the frozen $\Lambda$ gradient. Eigenfunction tracking confirms a continuous $g_1$ branch, and representative DD-ME2 calculations reproduce this hierarchy. The direct full-GR frozen-composition phase shifts satisfy $|\Delta\Phi_{g_1}|\leq1.410\times10^{-3}$ rad, a factor of 21 below the $0.03$-rad favorable-event scale for the Einstein Telescope. An exotic species therefore produces a distinct composition mode only if its composition gradient, or a coupled slowly equilibrating gradient, survives over the oscillation period.
Comments:
20 pages, 9 figures, 8 tables
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2607.20693 [pdf]
0 citations
07
[Submitted on 23 Jul 2026] (cross-list from hep-th)
Flavour current correlators and the non-Abelian hydrodynamic approximation: the charged sector
Thomas Apostolidis🇫🇷 · Matti Järvinen🇨🇳 · Elias Kiritsis🇫🇷 · Francesco Nitti🇫🇷 · Andrea Olzi🇫🇷 · Edwan Préau🇳🇱
Flavor-current correlators are studied in strongly-coupled dense (holographic) matter, at finite quark chemical potential $μ_{q}$ and finite isospin asymmetry. The non-Abelian hydrodynamic description of the charged currents is derived in the presence of an isospin chemical potential $μ_{3}$ . The two-point correlators of charged currents are then computed holographically at finite quark and isospin chemical potentials. In the near-extremal hydrodynamic regime, $ω, k, T, μ_{3} ≪ μ \equiv μ_{q}^{2} + μ_{3}^{2}$ , relevant for cold strongly coupled matter, the IR properties of the correlators are studied. It is shown that in this regime, the correlators agree with the non-Abelian hydrodynamic predictions. Therefore, the traditional regime of validity of standard hydrodynamics extends beyond $ω, k ≪ T ≪ μ$ to the so-called extended hydrodynamic regime $T ≪ ω, k ≪ μ$ . The holographic product formula is applied to the present non-Abelian system, and is used to propose an extended hydrodynamic approximation capturing both hydrodynamic-like poles and the leading effect of AdS $_{2}$ poles, by resumming the low- $ω$ logarithms. The results are verified through a detailed numerical analysis of the exact correlators and quasi-normal mode spectrum.
Comments:
70 pages plus appendices
Subjects:
High Energy Physics — Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); Strongly Correlated Electrons (cond-mat.str-el); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2607.20991 [pdf]
0 citations
08
[Submitted on 23 Jul 2026] (cross-list from hep-ph)
Advanced Statistical Analysis of Linear and Nonlinear Regge Trajectories for Light Non-strange Mesons
S.S. Afonin🇷🇺
A rigorous statistical analysis of Regge-type trajectories for light non-strange meson mass spectra is carried out, which explicitly accounts for experimental uncertainties. We test three scenarios: a linear model with distinct radial ( $n$ ) and orbital ( $l$ ) slopes (Model 1), a linear model with a universal slope (Model 2), and a nonlinear model featuring a universal slope and a Dirac-Coulomb-type term $\propto (l + 1)^{- 1}$ (Model 3). Optimization is performed using a nonlinear $χ^{2}$ minimization framework, where the intrinsic theoretical model uncertainty is determined self-consistently by enforcing $χ^{2} / dof = 1$ . To ensure robust model selection, we employ the Akaike and Bayesian information criteria alongside complementary statistical tests. Our analysis demonstrates that moderate deviations from linearity in the Regge spectrum are predominantly localized within the $S$ -wave resonance sector. These distortions are successfully accommodated by the nonlinear correction in Model 3, from which an approximate Coulomb-type degeneracy, $m^{2} (n, l) \propto n + l$ , emerges as a statistically robust feature. Furthermore, we show that the $l$ -dependent correction to the principal quantum number in light non-strange mesons is consistent with the leading-order relativistic correction to the Coulomb problem.
Comments:
23 pages, 2 figures, 7 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2607.21035 [pdf]
0 citations
09
[Submitted on 23 Jul 2026] (cross-list from hep-lat)
Spin and momentum fraction carried by partons in the nucleon
Constantia Alexandrou (University of Cyprus & The Cyprus Institute) · Simone Bacchio (The Cyprus Institute) · Jacob Finkenrath (Wuppertal University) · Christos Iona (University of Cyprus & The Cyprus Institute) · Giannis Koutsou (The Cyprus Institute) · Christian Kummer · (University of Cyprus & Technical University of Berlin) · Yan Li (The Cyprus Institute) · Bhavna Prasad (The Cyprus Institute) · Gregoris Spanoudes (University of Cyprus)
We determine the momentum fraction and angular momentum carried by quarks and gluons in the proton in lattice QCD. We use four ensembles simulated with up, down, strange and charm quarks with their masses tuned to their physical values. These ensembles have similar physical volume and different lattice spacings allowing us to take the continuum limit directly at the physical pion mass point. We extract the quark and gluon momentum fractions and total angular momentum in the continuum limit as well as the intrinsic quark spin and orbital angular momentum contributions to the proton spin. We find the total momentum fraction $⟨ x_{N} ⟩ = 0.995 (60) (29)$ and the total spin $J_{N} = 0.507 (43) (65)$ , showing that both the momentum and spin sum rules are satisfied. We compare our results to those extracted from phenomenological analyses.
Comments:
8 pages and 7 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2607.21230 [pdf]
0 citations
10
[Submitted on 23 Jul 2026] (cross-list from quant-ph)
Fault-tolerant quantum algorithms for simulating atomic nuclei
James Benstead🇬🇧 · Michael Garn🇬🇧 · Neil Gaspar🇬🇧 · Sean Greenaway🇬🇧 · Angus Kan🇬🇧 · Lloyd La Ronde🇬🇧 · Chandan Sarma🇬🇧 · Paul Stevenson🇬🇧
To maximize the value of fault-tolerant quantum computers, it is essential to develop concrete applications beyond well-established domains such as chemistry and condensed-matter physics. Here we construct and compile quantum algorithms to simulate the structure of atomic nuclei -- a topic that has received relatively little attention from the quantum computing community despite its similarities to the electronic structure problem in chemistry -- via effective shell-model Hamiltonians and no-core-shell-model Hamiltonians with three-body interactions derived from chiral effective field theory. Furthermore, we provide quantum resource estimates, in terms of Toffoli gate and qubit counts, for these algorithms, which, to our knowledge, are the first such estimates for fault-tolerant quantum simulation of atomic nuclei. Notably, the estimates for $^{32}$ Mg and $^{219}$ At shell-model Hamiltonians are comparable to recent estimates of Femoco simulations, a standard benchmark in chemistry. For no-core-shell-model Hamiltonians suitable for light nuclei (up to $^{40}$ Ca or so), we find that resource requirements are significantly higher, suggesting that more bespoke strategies are required to make such simulations practicable. Throughout this work, we draw upon the similarities between nuclear and electronic structure problems, while also highlighting challenges that are specific to the former. We hope this work will spur long-term collaborations between the nuclear and quantum computing community with the ultimate goal of realizing useful nuclear simulations on quantum computers.
Comments:
20 pages, 10 figures, 14 tables
Subjects:
Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
arXiv:
2607.21563 [pdf]
1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Reaction-constrained composition \(g\)-modes in neutron stars with antikaon condensates, hyperons, and \(\Delta(1232)\) resonances

Flavour current correlators and the non-Abelian hydrodynamic approximation: the charged sector

Advanced Statistical Analysis of Linear and Nonlinear Regge Trajectories for Light Non-strange Mesons

Spin and momentum fraction carried by partons in the nucleon

Fault-tolerant quantum algorithms for simulating atomic nuclei

Affiliations