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Nuclear Theory·nucl-th

Thursday·February 26, 2026

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 03

    [Submitted on 23 Feb 2026] (cross-list from math-ph)

    Lorentz-boosted diffusion: initial value formulation and exact solutions

    Lorenzo Gavassino

    It is well known that the diffusion equation, when treated as a stand-alone partial differential equation, exhibits exponential instabilities in boosted frames, which render the corresponding initial-value problem ill-posed. Recently, however, it was shown that Fick-type diffusion arises as the exact hydrodynamic sector of relativistic Fokker-Planck kinetic theory. In this work, we exploit this kinetic embedding to formulate a modified initial-value problem for one-dimensional Lorentz-boosted diffusion. We show that the resulting dynamics are well posed both forward and backward in time, provided the boosted density profiles admit a kinetic-theory realization. Such profiles form a space of band-limited functions, within which the evolution can be expressed as a discrete superposition of spatially sampled initial data, weighted by a Shannon-Whittaker-type Green function defined on the full Minkowski plane. The Green function is obtained in closed analytic form.

    Comments:
    13 pages, 5 figures, published in PRD (see https://journals.aps.org/prd/abstract/10.1103/k646-mgz5)
    Subjects:
    Mathematical Physics (math-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Theory (hep-th); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    2602.21254 [pdf]
    PRD(2026)·3 citations
  2. 04

    [Submitted on 24 Feb 2026] (cross-list from astro-ph.HE)

    Collapse of Magnetized White Dwarfs as site of Heavy Element Formation and Kilonova Signal

    Tetyana Pitik🇺🇸 · David Radice🇺🇸 · Daniel Kasen🇺🇸 · Fabio Magistrelli🇩🇪 · Patrick Chi-Kit Cheong🇺🇸 · Sebastiano Bernuzzi🇩🇪

    We present the first end-to-end calculation connecting the accretion-induced collapse (AIC) of a magnetized, rapidly rotating white dwarf to observable kilonova signatures, combining 2D general-relativistic neutrino-magnetohydrodynamic simulations, followed by radiation hydrodynamics with in-situ nuclear network and 2D Monte Carlo radiative transfer with spatially resolved heating rates. Unlike all previous unmagnetized AIC models - which predicted proton-rich, Ni-dominated ejecta - strong magnetic fields eject of neutron-rich material on dynamical timescales, before neutrino irradiation can raise the electron fraction, enabling strong -process nucleosynthesis up to and beyond the third peak. The resulting kilonova is lanthanide-rich and dominated by near-infrared emission. We compute synthetic light curves in the LSST and JWST bands and find striking agreement, without parameter tuning, between the observations of AT 2023vfi/GRB 230307A and our broadband light curves for polar viewing angles. These results establish magnetized AIC as a viable channel for heavy -process element production and a compelling progenitor candidate for long-duration gamma-ray bursts with kilonova signatures.

    Comments:
    14 pages, 13 figures. Published on MNRAS; added 2 figures and one appendix, conclusions unchanged
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2602.21291 [pdf]
    MNRAS(2026)·6 citations
  3. 05

    [Submitted on 24 Feb 2026] (cross-list from astro-ph.HE)

    Shock-induced chiral magnetic effect

    Steven P. Harris🇺🇸 · Srimoyee Sen🇺🇸

    Weak-interaction-mediated chiral imbalance generation in idealized massless electrons during core-collapse supernovae was once proposed to be the source of strong magnetic fields found in neutron stars. The effect goes by the name of chiral plasma instability (CPI). However, it was found that a finite electron mass damps out this process, inactivating the instability and preventing magnetic field growth. In this work we show that the instability can survive in the presence of abrupt density and temperature perturbation that drives the system sufficiently far out of weak equilibrium. As an example, we work with such perturbations generated by shockwaves which are common during both core collapse as well as neutron star mergers. We find that the chiral imbalance resulting from shock waves, under the right conditions of density and temperature, can sustain the chiral plasma instability despite the damping from the electron mass. Additionally, in an already magnetized medium, the chiral magnetic effect resulting from shock wave density and temperature perturbation can generate substantial ohmic heating. Our results imply that shockwaves generated in core-collapse supernovae and merging neutron stars can act as a source of strong heating in a magnetized medium as well as CPI.

    Comments:
    22 pages, 8 figures (published version)
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2602.21294 [pdf]
    PRD(2026)·0 citations
  4. 06

    [Submitted on 25 Feb 2026] (cross-list from hep-lat)

    Phase diagram of the single-flavor Gross--Neveu--Wilson model from the Grassmann corner transfer matrix renormalization group

    Jian-Gang Kong🇨🇳 · Shinichiro Akiyama🇯🇵 · Tao Shi🇨🇳 · Z. Y. Xie🇨🇳

    We investigate the phase structure of the single-flavor Gross--Neveu model with Wilson fermions using the Grassmann corner transfer matrix renormalization group (CTMRG). The path integral is formulated as a two-dimensional Grassmann tensor network and approximately contracted by the Grassmann CTMRG algorithm. We investigate the phase diagram by varying the fermion mass and the four-fermion coupling, using the pseudoscalar condensate as an order parameter for the parity symmetry breaking phase. The universality classes of the phase boundaries are identified through the central charge obtained via scaling analysis of the entanglement entropy. Furthermore, we extract the quantity related to the entanglement spectrum from the converged CTMRG environments, allowing us to distinguish the topological insulator phase and the trivial phase. The resulting phase structure suggests that the Aoki phase is separated from the other phases by critical lines characterized by , while the critical lines with separate the topological insulating and trivial phases. Our numerical results also indicate that the Aoki phase does not persist in the strong-coupling regime for the single-flavor theory.

    Comments:
    26 pages, 20 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
    arXiv:
    2602.21705 [pdf]
    PRD(2026)·3 citations
  5. 07

    [Submitted on 25 Feb 2026] (cross-list from hep-th)

    A Consistent Holographic Analysis of Anomaly-induced Charge Transport in the D3/D7 Model

    Shin Nakamura🇯🇵 · Kensei Tanaka🇯🇵

    We propose a scheme to correctly incorporate the contribution of the chiral anomaly in the D3/D7 model to calculate chiral transport phenomena. To ensure the D7-brane wraps S^5 appropriately and the Wess-Zumino term is switched on, we allow the D7-brane to rotate in the compactified extra directions and perform the analysis accordingly. To demonstrate that this calculation procedure works well, we specifically compute the magnetoresistance in the D3/D7 model. We find that a finite axial chemical potential is realized and the negative magnetoresistance is enhanced by the anomaly contribution.

    Comments:
    v1: 19 pages, 2 figures, v2: 20 pages, 2 figures, reference added, accepted version for publication in JHEP
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2602.21769 [pdf]
    JHEP(2026)·1 citation
  6. 08

    [Submitted on 25 Feb 2026] (cross-list from quant-ph)

    Trade-offs in Gauss's law error correction for lattice gauge theory quantum simulations

    Balint Pato🇺🇸 · Natalie Klco🇺🇸

    Gauss's law-based quantum error correction (GLQEC) offers a promising approach to reducing qubit overhead in lattice gauge theory simulations by leveraging built-in symmetries. For applications of GLQEC to 1+1D lattice quantum electrodynamics (QED), we identify two significant trade-offs. First, we prove via dimension-counting arguments that GLQEC requires periodic electric fields, thereby constraining the design space for lattice QED simulations. Second, we numerically compare GLQEC with a universal quantum error correction (UQEC) code, specifically the bitflip repetition code, and find that while GLQEC can achieve lower logical error rates in single-round error correction, it exhibits faster decoherence to the steady-state mixed ensemble under multiple rounds. The mixing speed penalty is manifest in observables of interest for both memory experiments and Hamiltonian evolution. We identify a mixing speed threshold, , above which using GLQEC exhibits even faster decoherence than without error correction. Our results highlight fundamental limitations of symmetry-based error correction schemes and inform corresponding constraints on formulations of lattice gauge theories compatible with error-robust quantum simulation techniques.

    Subjects:
    Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2602.22121 [pdf]
    10 citations

Affiliations

first authorsco-authorsvia INSPIRE