Anisotropic distribution of Ultra-High Energy Cosmic Rays
Advisor: Federico Urban (CEICO, IP CAS)
Funding: Fully funded
Website: https://ceico.cz/team/researchers/federico-urban

The origin of cosmological Ultra-High Energy Cosmic Rays (UHECRs) is still unknown: we do not know where they come from, nor whether they are protons or heavy nuclei; their sources have not been identified all models of particle acceleration in known astrophysical objects are challenged by the existence of particles with energies exceeding 100 EeV [1,2,3]. If UHECRs are produced by extra-Galactic sources that trace the distribution of visible matter, there should be a characteristic anisotropy on the UHECR arrival direction distribution. Alternatively, if UHECRs are a product of the decay of heavy relic particles, topological defects, or of some exotic acceleration mechanism near black holes, their distribution in the sky would be completely different. The anisotropy in the UHECR flux is thus one of the most important features that could help to solve the UHECRs mystery.

We seek a PhD student interested in working on UHECRs anisotropy, in a broadly defined sense. The student could be focussing on several aspects related to UHECRs anisotropy, which involve learning and working with publicly available codes, writing new code, studying the behaviour of UHECRs in Galactic and extra-Galactic magnetic fields, model and test possible correlations of UHECRs with other messengers, such as neutrinos, high-energy photons, gravitational waves, and more.

References:
[1] Ultra High Energy Cosmic Rays and the highest energies in the Universe, https://arxiv.org/abs/arXiv:1905.08250
[2] Highlights from the Telescope Array Experiment, https://pos.sissa.it/301/1096/
[3] Highlights from the Pierre Auger Observatory, https://pos.sissa.it/358/004/
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