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Updated: Jun 30, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
First Constraints on the Photon Coupling of Axionlike Particles from Multimessenger Studies of the Neutron Star
P S Bhupal Dev1, Jean-François Fortin2, Steven P Harris3
1Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA.
Abstract:
We use multimessenger observations of the neutron star merger event GW170817 to derive new constraints on axionlike particles (ALPs) coupling to photons. ALPs are produced via Primakoff and photon coalescence processes in the merger, escape the remnant, and decay back into two photons, giving rise to a photon signal approximately along the line of sight to the merger. We analyze the spectral and temporal information of the ALP-induced photon signal and use the Fermi Large Area Telescope (Fermi-LAT) observations of GW170817 to derive our new ALP constraints. We also show the improved prospects with future MeV γ-ray missions, taking the spectral and temporal coverage of Fermi-LAT as an example.
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