Cosmology of Scalar Field Dark Matter with Self-Interactions
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Abstract
In the standard model of the universe, the presence of a cold and dark form of matter is essential for explaining a wide range of observables, from the very largest scales such as the microwave background radiation, to galaxies and sub-galactic scales. However, despite this dark matter being about five times more abundant than all of the visible matter in our universe, its true identity is a complete mystery. Unveiling the fundamental nature of dark matter would contribute to a deeper understanding of our universe and the physical laws that govern it, and is therefore one of the Holy Grails of modern physics. In this thesis I have explored how dark matter behaves (in sometimes surprising ways) in models where the hypothetical dark matter particle is very light and self-interacting, using both theoretical tools and numerical simulations. This effort has contributed to an improved understanding of these models in certain scenarios, as well as provided additional constraints on the free parameters of these models by investigating their effect on observables.List of papers
Paper I. Stian T. H. Hartman, Hans A. Winther, and David F. Mota “Collapse of spherical overdensities in superfluid models of dark matter”. In: Astronomy and Astrophysics, July 2020, vol. 639, A90. DOI: 10.1051/0004-6361/201937263. arXiv: 1911.11498. The article is included in the thesis. Also available at: https://doi.org/10.1051/0004-6361/201937263 |
Paper II. Stian T. H. Hartman, Hans A. Winther, and David F. Mota “Dynamical friction in Bose-Einstein condensed self-interacting dark matter at finite temperatures, and the Fornax dwarf spheroidal”. In: Astronomy & Astrophysics, March 2021, vol. 647, A70. DOI: 10.1051/0004-6361/202039865. arXiv: 2011.00116. The article is included in the thesis. Also available at: https://doi.org/10.1051/0004-6361/202039865 |
Paper III. Stian T. H. Hartman, Hans A. Winther, and David F. Mota “Constraints on self-interacting Bose-Einstein condensate dark matter using largescale observables”. In: Journal of Cosmology and Astroparticle Physics, February 2022, vol. 2022, 2. DOI: 10.1088/1475-7516/2022/02/005. arXiv: 2108.07496. The article is not available in DUO due to publisher restrictions. The published version is available at: https://doi.org/10.1088/1475-7516/2022/02/005 |
Paper IV. Stian T. H. Hartman, Hans A. Winther, and David F. Mota “Cosmological simulations of self-interacting Bose-Einstein condensate dark matter”. Accepted in: Astronomy & Astrophysics. arXiv: 2203.03946. To be published. The paper is not available in DUO awaiting publishing. |