16th November 2020: Master Thesis Defense

Speaker: Florian Brüser. Location: Virtually; 3 pm
With a new generation of upcoming galaxy surveys (e.g. EUCLID, DESI, 4-MOST, J-PAS, LSST), new opportunities to discover new physics will arise (e.g. new fundamental particles, breakdown of General Relativity, or hints on the nature of cosmic acceleration). In the field of cosmology, one of the most important challenges is constraining cosmological parameters using the spatial distribution (clustering) of galaxies. By comparing the observed galaxy distribution with those predicted by numerical simulation, and by exploring how such predictions change when varying the physics in the simulations, we can obtain constraints on the physics that governs our Universe.
We develop a new technique that uses the "scaling" of cosmological simulations along with a new generation of galaxy mocks that we develop that are able of reproducing the clustering of complex hydrodynamic simulations. The use of these "scale" simulations allowed us to have more realistic galaxy mocks, capable of reaching smaller scales compared to other more simplistic methods. This will help us to reduce the error on the constraints of cosmological parameters, as well as break some degeneracies that appear when using only large scales.
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