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Theses

Phenomenology of dark matter particles at the centers of galaxies

Abstract : Unveiling the nature of dark matter is one of the greatest challenges of modern physics, at the interface between astrophysics, cosmology and particle physics. In this thesis, I tackle various aspects of indirect searches for dark matter particles, which provide a complementary approach to direct detection or collider experiments. We are now entering into an era of instruments with outstanding capabilities, so it was timely to tackle the problem of the dark matter density profile at the centers of galaxies with novel methods, which motivated this thesis. Taking advantage of these technological advances, I investigate new ways of probing the very central part of dark matter halos, especially focusing on dark matter spikes, i.e. very strong enhancements of the dark matter density that can form around supermassive black holes. I show that we can go beyond standard dark matter searches by studying photon emission from electrons and positrons produced in dark matter annihilation processes. In this context, I describe a new cosmic-ray propagation technique to account for injection by spiky distributions at the centers of galaxies. I develop novel models of the diffuse emission in the central regions of galaxies, focusing not only on the center of the Milky Way, but on the central regions of other galaxies as well. This allows me to explain recently reported observations and make predictions for future observations.
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Submitted on : Tuesday, September 20, 2016 - 1:57:34 PM
Last modification on : Thursday, December 10, 2020 - 11:02:39 AM

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  • HAL Id : tel-01369006, version 1

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Thomas Lacroix. Phenomenology of dark matter particles at the centers of galaxies. Astrophysics [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2016. English. ⟨NNT : 2016PA066060⟩. ⟨tel-01369006⟩

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