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Sources and detection of high-energy cosmic events

Abstract : In the last decade, new classes of sources (fast radio burst, binary neutron star mergers, ...) have been discovered thanks to progress in photon astronomy at all wavelengths. With the advent of multimessenger astronomy, we were able to scrutinize them with cosmic rays, neutrinos, photons and gravitational waves. The first part of this thesis is dedicated to the study of the high-energy and ultra-high energy neutrinos. Since the discovery in 2013 by IceCube of a diffuse neutrino flux, two major questions have been raised: what are the sources of this diffuse flux, and can we detect neutrinos at higher energies (> PeV). To help answering these questions, we first present a model of high-energy neutrino emissions from neutron star mergers. We then examine the radio detection of extensive air showers induced by ultra-high-energy neutrinos, with a study of a detector optimisation, and a detailed analysis of the signal characteristics and develops a reconstruction procedure. The second part of this thesis is dedicated to the study of the fast radio bursts. These brief, coherent and numerous radio pulses, have not been identified yet and many experimental unknowns remain. We first propose a source model focusing on the question of the pulses rates. Finally, we present an observational program conducted with the NenuFAR instrument, located in the Nançay Radio Astronomy Station, dedicated to the detection and the characterisation of FRBs at low frequency (<100MHz).
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https://tel.archives-ouvertes.fr/tel-03153273
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Submitted on : Friday, February 26, 2021 - 11:34:15 AM
Last modification on : Sunday, June 26, 2022 - 3:05:34 AM
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DECOENE_Valentin_2020.pdf
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  • HAL Id : tel-03153273, version 4

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Valentin Decoene. Sources and detection of high-energy cosmic events. High Energy Astrophysical Phenomena [astro-ph.HE]. Sorbonne Université, 2020. English. ⟨NNT : 2020SORUS028⟩. ⟨tel-03153273v4⟩

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