Nuclear Theory·nucl-th

Tuesday·September 23, 2025

12 papers—7 primary·5 cross-listed

08
[Submitted on 20 Sept 2025] (cross-list from hep-ph)
Anomalous Dynamical Screening of Relativistic Plasma in a Magnetic Field
Sota Hanai🇯🇵
We study collective excitations in a relativistic collisionless plasma composed of massless fermions subject to an external magnetic field. We include dynamical electromagnetism and fluctuations of the chiral charge, while maintaining a vanishing net chiral charge. Within the framework of chiral kinetic theory, we find that the chiral anomaly gives a correction to the transverse photon self-energy and that a novel type of dynamical screening can emerge. In the strong magnetic field limit, we also show that the collective mode has a gap using the lowest Landau level approximation. We further discuss implications of the anomalous dynamical screening for neutron star phenomenology.
Comments:
17 pages; v2: published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2509.16652 [pdf]
PTEP(2026)·1 citation
09
[Submitted on 21 Sept 2025] (cross-list from quant-ph)
Quantum Late-Time Decay and Channel Dependence
Francesco Giacosa🇵🇱 · Anna Kolbus🇵🇱 · Krzysztof Kyziol🇵🇱 · Magdalena Plodowska🇵🇱 · Milena Piotrowska🇵🇱 · Karol Szary🇵🇱 · Arthur Vereijken🇵🇱
Quantum mechanics predicts deviations from exponential decay at short and long times, yet experimental evidence is limited. We report a power-law tail after $\sim$ 10 lifetimes in two fluorescent compounds (erythrosine~B and eosine Y), confirmed by two detectors probing distinct bands but yielding different power coefficients. The data match a divergent but normalizable spectral density, and theory predicts oscillations as a future test. A novel and general result is that in multichannel QM (and QFT) decay, the lifetime is universal, but the late-time deviations are channel- (or band-) dependent, a feature consistent with our data.
Comments:
12 pages, 4 figures, 4 tables. To appear in PRA
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2509.17163 [pdf]
PRA(2026)·1 citation
10
[Submitted on 22 Sept 2025] (cross-list from hep-ph)
Electromagnetic structure of axial-vector mesons and implications for the muon $g - 2$
Zanbin Xing🇨🇳 · Lei Chang🇨🇳 · Khépani Raya🇪🇸
The electromagnetic structure of axial-vector mesons is investigated via elastic and two-photon transition form factors (TFFs). To this end, we employ a framework based on the Dyson-Schwinger and Bethe-Salpeter equations within a contact interaction model. This largely algebraic approach transparently exposes the role of symmetries and their breaking, and has proven successful in describing anomaly-sensitive processes, including pseudoscalar to two-photon TFFs, $γ \to 3 π$ , and vector-to-pseudoscalar radiative decays. Restricting our analysis to the lowest-lying states, $A = {a_{1}, f_{1}, f_{1}^{'}}$ , we also evaluate the corresponding light-by-light contribution to the muon anomalous magnetic moment, and obtain $a_{μ}^{A} = 11.30 (4.71) \times 1 0^{- 11}$ , consistent with contemporary estimates.
Comments:
14 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2509.17311 [pdf]
PRD(2026)·2 citations
11
[Submitted on 22 Sept 2025] (cross-list from physics.atom-ph)
Investigating Roles of Triple Excitations for High-precision Determination of Clock Properties of Alkaline Earth Metal Singly Charged Ions
A. Chakraborty · Vaibhav Katyal · B. K. Sahoo
High-accuracy calculations of electric dipole polarizabilities and quadrupole moments ( $Θ$ ) of the clock states of the singly charged calcium (Ca $^{+}$ ), strontium (Sr $^{+}$ ) and barium (Ba $^{+}$ ) alkaline-earth ions are estimated by employing relativistic coupled-cluster (RCC) theory. It demonstrates importance of the triple excitations in the RCC method for precise determination of the above quantities. We also observe a different trend of correlations in the $Θ$ values than an earlier study with respect to orbitals from higher angular momenta. Reliability of the results is verified by comparing the calculated energies, magnetic dipole hyperfine structure constants, and lifetimes of the atomic states with the experimental values of the $^{43}$ Ca $^{+}$ , $^{87}$ Sr $^{+}$ and $^{137}$ Ba $^{+}$ ions. Nuclear quadrupole moments of these isotopes are also estimated by combining calculations with the measured electric quadrupole hyperfine structure constants, showing large deviations from the literature values.
Comments:
Manuscript(8 pages, 6 Tables); Supplemental Materials(6 pages, 5 Tables)
Subjects:
Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2509.17512 [pdf]
PRA(2026)·2 citations
12
[Submitted on 22 Sept 2025] (cross-list from hep-th)
Thermodynamics of rotating fermions
Victor E. Ambrus🇷🇴 · Aleksandar Gecić🇷🇴
We consider the thermodynamic properties of a rotating gas of fermions. We begin by constructing the thermodynamic potential $Φ$ and its associated current $ϕ^{μ}$ within the grand canonical ensemble of a macroscopic rigidly rotating body, where the ensemble parameters are the temperature $T_{0}$ and chemical potential $μ_{0}$ on the rotation axis, as well as the rotation angular velocity $Ω_{0}$ . We then consider the problem of local thermodynamics, where the thermodynamic state is defined by the local temperature $T$ and chemical potential $μ$ , as well as the local spin potential tensor, $Ω_{μν}$ . We find the thermodynamic pressure $P$ , given as the sum of the usual classical (non-quantum) pressure and other corrections due to the spin potential and the kinematic state of the fluid. We compute the associated entropy, charge and spin densities, and show they are consistent with the Euler relation.
Comments:
8 pages, no figures, no tables, no compromises. genuine thermodynamics
Subjects:
High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2509.17640 [pdf]
4 citations

Affiliations

first authorsco-authorsvia INSPIRE

Anomalous Dynamical Screening of Relativistic Plasma in a Magnetic Field

Quantum Late-Time Decay and Channel Dependence

Electromagnetic structure of axial-vector mesons and implications for the muon g−2

Investigating Roles of Triple Excitations for High-precision Determination of Clock Properties of Alkaline Earth Metal Singly Charged Ions

Thermodynamics of rotating fermions

Affiliations

Electromagnetic structure of axial-vector mesons and implications for the muon $g - 2$