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Creswick, Richard; Avignone, Frank T
arXiv.org, 03/2022Paper, Journal Article
In this paper we outline an experiment to detect the conversion of photons to axion-like particles (ALPs) in a strong magnetic field. We show that by modulating the polarization of the light passing through a Fabry-Perot cavity so that it effectively precesses at the modulation frequency, a signal is produced that is proportional to the square as opposed to the fourth power of the ALP-photon coupling constant. Assuming shot noise to be the dominant source of noise, we estimate that this approach is sensitive ALP masses less than \(10^{-4} eV\) and couplings on the order to \(g_{a\gamma}\sim 1.6\times 10^{-11} \text{GeV}^{-1}\) with a 10m, 10 T magnet, and \(g_{a\gamma}\sim 1.6\times 10^{-12} \text{GeV}^{-1}\) with a 100 m magnet as envisaged by ALPs-IIc. ALPs with these properties have been invoked to explain the apparent transparency of the extragalactic background light (EBL) to ultra high-energy gamma rays emitted by BLAZARs.
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