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From gamma rays to radio waves : Dark Matter searches across the spectrum

Abstract : Dark matter is one of the most fascinating open problems in modern physics. One interesting explanation is that it is composed of new particles, which are not included in the Standard Model. My doctoral thesis focuses on the indirect detection of these particles: the basic idea is that dark matter particles can annihilate or decay and produce cosmic rays detectable with our present and future telescopes. It is reasonable to think that particles of different masses can produce different signals, therefore the study of different messengers can provide additional information about their properties. I focused on studying gamma rays, X rays and radio waves that can be produced by particles with a mass range from MeV to TeV. In particular, I obtained the prediction of the cross-correlation signal between the extragalactic gamma-ray flux, measured by the Fermi Gamma-Ray Space Telescope, and the 21 cm line emitted by hydrogen in dark matter halos, observable with the MeerKAT and SKA radio telescopes. In addition, I obtained the limits on the effective annihilation cross-section of dark matter particles by comparing the X-ray flux measured by the INTEGRAL Space Telescope with the theoretical signal provided in the case of particles with a mass between 1 MeV and 5 GeV. Finally, a signal emerges from the radio maps of the GLEAM survey that seems to come from filaments of unknown origin. I gave an interpretation of this signal in terms of the synchrotron radiation produced by dark matter filaments.
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Submitted on : Tuesday, October 25, 2022 - 12:09:38 PM
Last modification on : Friday, December 2, 2022 - 3:21:01 AM

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PINETTI_Elena_these_2021.pdf
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  • HAL Id : tel-03828527, version 1

Citation

Elena Pinetti. From gamma rays to radio waves : Dark Matter searches across the spectrum. Astrophysics [astro-ph]. Sorbonne Université; Università di Torino, 2021. English. ⟨NNT : 2021SORUS492⟩. ⟨tel-03828527⟩

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