Imprints of dark matter physics in cosmological large-scale structure

by Dr Martin Sahlén (Uppsala University)

Thursday 14 Nov 2019, 10:30 → 12:30 Europe/Stockholm

4101 (Ångström)

The properties of neutrinos and dark matter candidates produce characteristic imprints in the large-scale distribution of matter in the Universe. This has previously been used to place constraints on, e.g., the total mass of neutrinos. The next generation of astronomical galaxy surveys, e.g. from the Uppsala-affiliated projects 4MOST and the Square Kilometre Array, promise to vastly increase precision, covered area, and observational depth. This will enable novel, stringent constraints to be placed on the masses of neutrinos and dark matter candidates. As a specific case, I describe how the novel probe of cosmic voids can break awkward parameter degeneracies to produce robust constraints. I outline the first cosmological constraints derived from void abundance, and discuss the potential of void and galaxy cluster abundances to constrain the mass of neutrinos and reject an inverted neutrino mass hierarchy.

 

Based on ApjL 820(1), 7 (2016); PRD 97(10), 103504 (2018); PRD 99(6), 063525 (2019), arXiv:1810.02680, arXiv:1811.02743, arXiv:1903.05161

UU_HEP_Seminar_MSahlen_Nov2019.pdf