PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·June 30, 2023

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 28 Jun 2023]

    Multi-Body Entanglement and Information Rearrangement in Nuclear Many-Body Systems

    S. Momme Hengstenberg🇩🇪 · Caroline E. P. Robin🇩🇪 · Martin J. Savage🇺🇸

    We examine how effective-model-space (EMS) calculations of nuclear many-body systems rearrange and converge multi-particle entanglement. The generalized Lipkin-Meshkov-Glick (LMG) model is used to motivate and provide insight for future developments of entanglement-driven descriptions of nuclei. The effective approach is based on a truncation of the Hilbert space together with a variational rotation of the qubits (spins), which constitute the relevant elementary degrees of freedom. The non-commutivity of the rotation and truncation allows for an exponential improvement of the energy convergence throughout much of the model space. Our analysis examines measures of correlations and entanglement, and quantifies their convergence with increasing cut-off. We focus on one- and two-spin entanglement entropies, mutual information, and -tangles for to estimate multi-body entanglement. The effective description strongly suppresses entropies and mutual information of the rotated spins, while being able to recover the exact results to a large extent with low cut-offs. Naive truncations of the bare Hamiltonian, on the other hand, artificially underestimate these measures. The -tangles in the present model provide a basis-independent measures of -particle entanglement. While these are more difficult to capture with the EMS description, the improvement in convergence, compared to truncations of the bare Hamiltonian, is significantly more dramatic. We conclude that the low-energy EMS techniques, that successfully provide predictive capabilities for low-lying observables in many-body systems, exhibit analogous efficacy for quantum correlations and multi-body entanglement in the LMG model, motivating future studies in nuclear many-body systems and effective field theories relevant to high-energy physics and nuclear physics.

    Comments:
    24 pages, 14 figures
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2306.16535 [pdf]
    EPJA(2023)·45 citations
  2. 02

    [Submitted on 29 Jun 2023]

    Nucleosynthesis of light nuclei and hypernuclei in central Au+Au collisions at =3 GeV

    N. Buyukcizmeci🇹🇷 · T. Reichert🇩🇪 · A. S. Botvina🇩🇪 · M. Bleicher🇩🇪

    We analyze the experimental data on nuclei and hypernuclei yields recently obtained by the STAR collaboration. The hybrid dynamical and statistical approaches which have been developed previously are able to describe the experimental data reasonably. We discuss the intriguing difference between the yields of normal nuclei and hypernuclei which may be related to the properties of hypermatter at subnuclear densities. Most importantly new (hyper-)nuclei could be detected via particle correlations, and such measurements are relevant to pin down the production mechanism.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2306.17145 [pdf]
    PRC(2023)·18 citations
  3. 03

    [Submitted on 28 Jun 2023] (cross-list from quant-ph)

    Floquet insulators and lattice fermions

    Thomas Iadecola🇺🇸 · Srimoyee Sen🇺🇸 · Lars Sivertsen🇺🇸

    Floquet insulators are periodically driven quantum systems that can host novel topological phases as a function of the drive parameters. These new phases exhibit features reminiscent of fermion doubling in discrete-time lattice fermion theories. We make this suggestion concrete by mapping the spectrum of a noninteracting (1+1)D Floquet insulator for certain drive parameters onto that of a discrete-time lattice fermion theory with a time-independent Hamiltonian. The resulting Hamiltonian is distinct from the Floquet Hamiltonian that generates stroboscopic dynamics. It can take the form of a discrete-time Su-Schrieffer-Heeger model with half the number of spatial sites of the original model, or of a (1+1)D Wilson-Dirac theory with one quarter of the spatial sites.

    Comments:
    Figure label corrected
    Subjects:
    Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2306.16463 [pdf]
    PRL(2024)·8 citations
  4. 04

    [Submitted on 29 Jun 2023] (cross-list from hep-ph)

    Cross section for supernova axion observation in neutrino water Cherenkov detectors

    Pierluca Carenza🇸🇪 · Giampaolo Co'🇮🇹 · Maurizio Giannotti🇺🇸 · Alessandro Lella🇮🇹 · Giuseppe Lucente🇮🇹 · Alessandro Mirizzi🇮🇹 · Thomas Rauscher🇨🇭

    Axions coupled to nucleons might be copiously emitted from core-collapse supernovae (SNe). If the axion-nucleon coupling is strong enough, axions would be emitted from the SN as a burst and, reaching Earth, may excite the oxygen nuclei in water Cherenkov detectors (). This process will be followed by decay(s) of the excited state resulting in an emission of photons and thus providing a possibility for a direct detection of axions from a Galactic SN in large underground neutrino Cherenkov detectors. Motivated by this possibility, we present an updated calculation of axion-oxygen cross section obtained by using self-consistent continuum Random Phase Approximation. We calculate the branching ratio of the oxygen nucleus de-excitation into gamma-rays, neutrons, protons and -particles and also consider photon emission from secondary nuclei to compute a total spectrum created when axions excite . These results are used to revisit the detectability of axions from SN 1987A in Kamiokande-II.

    Comments:
    22 pages, 9 figures. Matches the version published on PRC. Changes: we employed different benchmark SN model with respect to the previous version, accounting for a 1D treatment of convection
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2306.17055 [pdf]
    PRC(2024)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE