APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Alex Barreira (LMU München)
Title: Connecting the visible Universe to the dark: recent numerical advances on galaxy bias predictions
Date (JST): Thu, Mar 31, 2022, 16:30 - 17:30
Place: Zoom
Related File: 2785.pdf
Abstract: Galaxy bias is the relationship between galaxy formation and the underlying (invisible) large-scale mass distribution, and studying it leads not only to improved cosmological constraints using galaxy data, but invariably also to new insights about the galaxy-environment connection. In this talk I will describe a number of recent breakthroughs made in our ability to make predictions for galaxy bias using hydrodynamical simulations of galaxy formation. By comparing to the bias of dark matter halos, I will discuss what these results can tell us about the environmental dependence of the galaxy-halo connection and the so-called assembly bias signal. I will also discuss how robust priors on galaxy bias from hydrodynamical simulations are imperative to the goal of many future galaxy surveys to constrain cosmology in general, and in particular, inflation models through searches for local-type primordial non-Gaussianity.