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Probing axionlike particles with multimessenger observations of neutron star mergers

Francesca Lecce1,2,*, Alessandro Lella1,2,†, Giuseppe Lucente3,‡, Vimal Vijayan4,§, Andreas Bauswein4,∥, Maurizio Giannotti5,6,¶, and Alessandro Mirizzi1,2,**

  • *Contact author: francesca.lecce@ba.infn.it
  • †Contact author: alessandro.lella@ba.infn.it
  • ‡Contact author: giuseppe.lucente@ba.infn.it
  • §Contact author: v.vijayan@gsi.de
  • ∥Contact author: a.bauswein@gsi.de
  • Contact author: mgiannotti@unizar.es
  • **Contact author: alessandro.mirizzi@ba.infn.it

Phys. Rev. D 112, 023001 – Published 1 July, 2025

DOI: https://doi.org/10.1103/krf3-lm4s

Abstract

Axion-like particles (ALPs) can be copiously produced in binary neutron star (BNS) mergers through nucleon-nucleon bremsstrahlung if the ALP-nucleon couplings gaN are sizable. The ALP-photon coupling gaγ may trigger conversions of ultralight ALPs into photons in the magnetic fields of the merger remnant and of the Milky Way. This effect would lead to a potentially observable short gamma-ray signal, in coincidence with the gravitational-wave signal produced during the merging process. This event could be detected through multimessenger observation of BNS mergers employing the synergy between gravitational-wave detectors and gamma-ray telescopes. Here, we study the sensitivity of current and proposed MeV gamma-ray experiments to detect such a signal. As an explicit example, we consider ALP couplings related as in the Kim-Shifman-Vainshtein-Zakharov axion model, and show that in this case the proposed instruments can reach a sensitivity down to gaγ≳few×10−13  GeV−1 for ma≲10−9  eV, comparable with the SN 1987A limit.

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