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Caustic-Like Structures in UHECR Flux after Propagation in Turbulent Intergalactic Magnetic Fields

  • NUCLEI, PARTICLES, FIELDS, GRAVITATION, AND ASTROPHYSICS
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Abstract

UHECR propagation in a turbulent intergalactic magnetic field in the small-angle scattering regime is well understood for propagation distances much larger than the field coherence scale. The diffusion theory doesn’t work and unexpected effects may appear for propagation over smaller distances, from a few and up to 10–20 coherence scales. We study the propagation of UHECRs in this regime, which may be relevant for intermediate mass UHECR nuclei and nG scale intergalactic magnetic fields with 1 Mpc coherence scale. We found that the trajectories form a non-trivial caustic-like pattern with strong deviation from isotropy. Thus, measurements of the flux from a source at a given distance will depend on the position of the observer.

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ACKNOWLEDGMENTS

Work of K.D., A.K., G.R. and I.T. was supported by the Russian Science Foundation grant 20-42-09010. The work of D.S. has been supported by the French National Research Agency (ANR) grant ANR-19-CE31-0020. Some of the results in this paper have been derived using the healpy and HEALPix packages.

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Authors and Affiliations

  1. Institute for Nuclear Research of the Russian Academy of Sciences, 117312, Moscow, Russia

    K. Dolgikh, G. Rubtsov & I. Tkachev

  2. Physics Department and Laboratory of Cosmology and Elementary Particle Physics, Novosibirsk State University, 630090, Novosibirsk, Russia

    K. Dolgikh, A. Korochkin, G. Rubtsov & I. Tkachev

  3. Université Libre de Bruxelles, CP225 Boulevard du Triomphe, 1050, Brussels, Belgium

    A. Korochkin

  4. APC, Université Paris Cité, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris 119, 75205, Paris, France

    D. Semikoz

Authors
  1. K. Dolgikh
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  2. A. Korochkin
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  3. G. Rubtsov
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  4. D. Semikoz
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  5. I. Tkachev
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Correspondence to K. Dolgikh.

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Dolgikh, K., Korochkin, A., Rubtsov, G. et al. Caustic-Like Structures in UHECR Flux after Propagation in Turbulent Intergalactic Magnetic Fields. J. Exp. Theor. Phys. 136, 704–710 (2023). https://doi.org/10.1134/S1063776123060031

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  • DOI: https://doi.org/10.1134/S1063776123060031

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