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Disputation: Stian Thomas Heimdal Hartman

Doctoral candidate Stian Thomas Heimdal Hartman at the Institute of Theoretical Astrophysics, Faculty of Mathematics and Natural Sciences, is defending the thesis "Cosmology of Scalar Field Dark Matter with Self-Interactions" for the degree of Philosophiae Doctor.

Profile photo of a young man with glasses
Doctoral candidate Stian Thomas Heimdal Hartman. Photo: ITA/UiO.

The PhD defence and trial lecture will be hybrid. Attendees can therefor participate either in-person or via Zoom. The link will be available the day before the disputation. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions either written or oral. This can be requested by clicking 'Participants -> Raise hand'.

Join the disputation

The meeting opens for participation just before the disputation starts, and closes for new participants approximately 15 minutes after the defence has begun.

Join the trial lecture - August 29th at 14:00 (Room 720, 7th floor (Niels Henrik Abels hus) / Zoom)

"Standard Sirens: Using Gravitational Waves from Black Hole Mergers in Distant Galaxies to Measure the Hubble Constant"

Conferral summary

Mesteparten av massen i universet vårt består av en hittil ukjent materie som er helt sentral for vår forståelse av hvordan struktur i universet har blitt til og oppfører seg. Denne doktorgradsavhandlingen utforsker eksotiske modeller for denne mørke og mystiske materien for å bedre forstå egenskapene deres og hvilke konsekvenser de har for observasjoner.

Main research findings:

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.

Contact information for the Department

Tags: PhD defense, disputas
Published Aug. 15, 2022 9:54 AM - Last modified Aug. 29, 2022 10:47 AM