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Search: WFRF:(Eckner Christopher) > (2024)

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1.
  • Calore, Francesca, et al. (author)
  • Uncovering axionlike particles in supernova gamma-ray spectra
  • 2024
  • In: Physical Review D. - 2470-0010 .- 2470-0029. ; 109:4
  • Journal article (peer-reviewed)abstract
    • A future Galactic supernova (SN) explosion can lead to a gamma-ray signal induced by ultralight axionlike particles (ALPs) thermally produced in the SN core and converted into high-energy photons in the Galactic magnetic field. The detection of such a signal is in the reach of the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope. The observation of gamma-ray emission from a future SN has a sensitivity to gaγ≳4×10−13  GeV−1 for a SN at fiducial distance of 10 kpc and would allow us to reconstruct the ALP-photon coupling within a factor of ∼2, mainly due to the uncertainties on the modeling of the Galactic magnetic field.
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2.
  • Ravensburg, Eike, 1995-, et al. (author)
  • Constraining MeV-scale axionlike particles with Fermi-LAT observations of SN 2023ixf
  • 2024
  • In: Physical Review D. - 2470-0010 .- 2470-0029. ; 109:2
  • Journal article (peer-reviewed)abstract
    • The Fermi-LAT observations of SN 2023ixf, a type II supernova in the nearby Pinwheel Galaxy, Messier 101 (M101), presents us with an excellent opportunity to constrain MeV-scale axionlike particles (ALPs). By examining the photon decay signature from heavy ALPs that could be produced in the explosion, the existing constraints on the ALP-photon coupling can be improved, under optimistic assumptions, by up to a factor of ∼2 for masses ma≲3  MeV. Under very conservative assumptions, we find a bound that is slightly weaker than the existing ones for ma≲0.5  MeV. The exact reach of these searches depends mostly on properties of the SN progenitor. This study demonstrates the relevance of core-collapse supernovae, also beyond the Magellanic Clouds, as probes of fundamental physics.
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