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Probing axion-like particles with multimessenger observations of neutron star mergers
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abstract
Axion-like particles (ALPs) can be copiously produced in binary neutron star (BNS) mergers through nucleon-nucleon bremsstrahlung if the ALP-nucleon couplings $g_{a N}$ are sizable. The ALP-photon coupling $g_{a\gamma}$ 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 multi-messenger 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 (KSVZ) axion model, and show that in this case the proposed instruments can reach a sensitivity down to $g_{a\gamma}\gtrsim \textrm{few} \times 10^{-13}\,\text{GeV}^{-1}$ for $m_a \lesssim 10^{-9}$ eV, comparable with the SN 1987A limit.
Forward citations
Cited by 5 Pith papers
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The Prospect from the Upcoming CMB Experiment LiteBIRD to Discover Axion-like Particles Using Milky Way
A template-based analysis of mock LiteBIRD CMB data suggests the satellite could constrain the photon-ALP coupling to below 6.5e-12 GeV^-1 for ALP masses below 1e-14 eV, about ten times stronger than the current CAST limit.
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Axion-like particle limits from multi-messenger sources
A jet-plus-corona model of NGC 1068, constrained by IceCube neutrinos, gives ALP-photon coupling limits g_aγ ≲ 7×10^-11 GeV^-1 for masses below 10^-9 eV, weaker than current bounds but offering a new multi-messenger route.
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Effects of dark matter and magnetic field on neutron star properties in relativistic mean-field theory: A single-fluid approach
Fermionic dark matter and strong central magnetic fields both reduce neutron-star maximum mass and radius and lower tidal deformability in single-fluid RMF models, remaining compatible with GW/NICER constraints over t...
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Fresh look at the diffuse ALP background from supernovae
Adding pion conversion to the diffuse supernova ALP background tightens the Fermi-LAT bound on the ALP-photon coupling to about 2e-13 GeV^-1 for ultralight ALPs, and SN 1987A remains roughly ten times stronger.
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Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments
The meV axion window is presented as a coherent, cross-validated search program in which string theory, stellar cooling, dark matter, and new detector concepts converge on the same mass range.
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