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Multimessenger Constraints on Radiatively Decaying Axions from GW170817
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abstract
The metastable hypermassive neutron star produced in the coalescence of two neutron stars can copiously produce axions that radiatively decay into $\mathcal{O}(100)$~MeV photons. These photons can form a fireball with characteristic temperature smaller than $1\rm\, MeV$. By relying on X-ray observations of GW170817/GRB 170817A with CALET CGBM, Konus-Wind, and Insight-HXMT/HE, we present new bounds on the axion-photon coupling for axion masses in the range $1$-$400\,\rm MeV$. We exclude couplings down to $5\times 10^{-11}\,\rm GeV^{-1}$, complementing and surpassing existing constraints. Our approach can be extended to any feebly-interacting particle decaying into photons.
Forward citations
Cited by 8 Pith papers
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Time-delayed gamma-ray signatures of heavy axions from core-collapse supernovae
No gamma-ray excess from four supernovae in Fermi-LAT data yields the strongest constraints yet on MeV-to-GeV heavy axions coupled to both QED and QCD.
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Minimal Electroweak Baryogenesis via Domain Walls
Domain wall cores in the minimal Z2-symmetric singlet extension can restore electroweak symmetry and, while sweeping through space, could produce the matter-antimatter asymmetry in a parameter region far lighter and m...
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Reappraisal of the Constraints on Heavy Axion-like Particles from Gamma-Ray Bursts
Realistic GRB parameters weaken previous ALP cooling bounds, but ALP-induced secondary fireballs in GRBs could still be probed via isotropic X-ray emission from future telescopes.
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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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Probing Heavy Axion-like Particles from Massive Stars with X-rays and Gamma Rays
Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.
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NuSTAR bounds on radiatively decaying particles from M82
NuSTAR's non-detection of an X-ray halo from decaying axions around M82 excludes a previously allowed window of axion-photon coupling for 30-500 keV axion masses.
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Glueball Axion-Like Particles
A pseudoscalar glueball from a dark Yang-Mills sector, called a GALP, is shown to behave like an axion-like particle and to be a viable dark matter candidate with a predicted mass-coupling relation.
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Lecture Notes: WISPs in gamma-ray astrophysics
The paper is a pedagogical review of axion-like particle searches in gamma-ray astrophysics, with tutorial derivations and a notebook-based analysis of NGC 1275, and it contains no new research result.
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