Harnessing the power of peculiar velocities for precise cosmology in the local Universe
ABSTRACT
KDESci Group Meeting (220th)
Speaker: Dr. Anthony Carr (Korea Astronomy and Space Science Institute)
Title: Harnessing the power of peculiar velocities for precise cosmology in the local Universe
Abstract: Peculiar velocities are an incredible cosmological tool in the nearby universe, and we can now take full advantage of them thanks to huge sample sizes afforded by ongoing and upcoming large-scale spectroscopic surveys. The structure of the galaxies we observe today, and how they move, was seeded in the early universe; their positions and peculiar velocities therefore trace the evolution from small density perturbations to the current cosmic web and tell us what universe is made of. As we continue to observe more peculiar velocity tracers, we can even search for evidence of modified gravity. I will demonstrate how we use peculiar velocity correlations to probe the growth of structure, fσ8, and also how large peculiar velocity surveys can be used to measure the expansion rate of the Universe, H0.
