Delta på disputasen 
PhD disputasen og prøveforelesningen vil være hybrid. Rommet åpnes for deltakelse like før disputasen starter, og stenger for nye deltakere omtrent 15 minutter etter at disputasen har startet.
Delta på prøveforelesning - 19. juni kl. 10:15 (Aud. 209, Svein Rosselands Hus)
"Could pulsars be the progenitors of fast radio bursts?"
Kreeringssammendrag
Dette arbeidet har brukt en nedenfra-og-opp-metodikk til å fremme vår forståelse av mørk materie på flere fronter. Vi har forbedret den numeriske behandlingen av såkalt ultralett mørk materie (FDM), funnet en ny nedre grense for dens masse og har kommet opp med en ny modell. Dette er den første i sitt slag for FDMs bølgeeffekter i kosmiske filamenter – motorveiene i universets mørke ryggrad.
Hovedfunn:
Since the advent of observational evidence for the mysterious, gravitationally interacting substance dubbed dark matter (DM) about a century ago, physicists have worked relentlessly to uncover its microphysical nature. Impressive theoretical frameworks have been developed, and increasingly sophisticated detectors constructed—yet, no direct detection has been achieved. Astrophysics offers a complementary perspective: rather than asking what dark matter is, we ask how it behaves.
In this thesis, I focus on ultralight (or “fuzzy”) dark matter—a class of models that posits the DM particle to be roughly a hundred billion billion billion times lighter than a proton. So light, in fact, that its dynamics resemble those of a wave rather than a classical particle, giving rise to a distinct set of phenomena in a “fuzzy” universe.
To this end, I decompose FDM’s dynamics and phenomena into their elementary building blocks. Lower-dimensional considerations allow me to compare and further develop numerical solution strategies. By reconstructing all possible FDM wave states within the dwarf galaxy Leo II, I derive a robust mass constraint that updates four-decade-old folk wisdom. Finally, by assembling a population of simplified yet fuzzy cosmic filaments, one at a time, I statistically reproduce results of fully-fledged simulations at significantly lower cost.
