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- W4290974061 abstract "The conversion of axionlike particles (ALPs) and photons in magnetised astrophysical environments provides a promising route to search for ALPs. The strongest limits to date on light ALPs use galaxy clusters as ALP--photon converters. However, such studies traditionally rely on simple models of the cluster magnetic fields, with the state-of-the-art being Gaussian random fields (GRFs). We present the first systematic study of ALP-photon conversion in more realistic, turbulent fields from dedicated magnetohydrodynamic (MHD) simulations, which we compare with GRF models. For GRFs, we analytically derive the distribution of conversion ratios at fixed energy and find that it follows an exponential law. We find that the MHD models agree with the exponential law for typical, small amplitude mixings but exhibit distinctly heavy tails for rare and large mixings. We explain how non-Gaussian, local spikes in the MHD magnetic field are mainly responsible for the heavy tail. Our results indicate that limits placed on ALPs using GRFs are conservative but that MHD models are necessary to reach the full potential of these searches." @default.
- W4290974061 created "2022-08-13" @default.
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- W4290974061 date "2022-08-08" @default.
- W4290974061 modified "2023-09-26" @default.
- W4290974061 title "Magnetohydrodynamics predicts heavy-tailed distributions of axion-photon conversion" @default.
- W4290974061 doi "https://doi.org/10.48550/arxiv.2208.04333" @default.
- W4290974061 hasPublicationYear "2022" @default.
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