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Nuclear Theory·nucl-th

Friday·June 30, 2023

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 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
  2. 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