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Chasing the cosmic accelerators with high energy astroparticles

Abstract : The advent of time-domain and multimessenger astronomy opens new perspectives to study the most energetic phenomena of our universe, and understand the mysterious origins of ultra-high-energy cosmic rays (UHECR) and high-energy (HE) neutrinos. Cosmic rays appear as key players in the production of non-thermal and, more generally, multimessenger emissions. In this thesis, we develop several analytical and numerical tools to study the acceleration and interactions of cosmic rays in the vicinity of energetic sources. As HE neutrinos are clear signatures of these processes, we study the detectability of HE neutrino flares from transient sources. We identify two interesting categories of sources, namely pulsars and tidal disruption events. We show with particle-in-cell simulations that pulsars can accelerate high-energy cosmic rays. We demonstrate that a population of millisecond pulsars located in the Galactic bulge can explain the di↵use gamma-ray emission observed by the HESS detector. Moreover, an extragalactic population of tidal disruptions by massive black holes powering relativistic jets can reproduce the spectrum and composition of UHECRs measured by the Auger experiment, but cannot produce the HE neutrinos detected by the IceCube experiment. Finally, we participate to the development of novel techniques that aim at detecting and reconstructing the properties of very-high-energy (VHE) neutrinos and UHECRs, in the context of the POEMMA and GRAND projects.
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Submitted on : Wednesday, September 23, 2020 - 2:12:09 PM
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  • HAL Id : tel-02411343, version 2

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Claire Guépin. Chasing the cosmic accelerators with high energy astroparticles. Astrophysics [astro-ph]. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS127⟩. ⟨tel-02411343v2⟩

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