Peculiar Velocity Cosmology and the New Generation of Surveys

par Ryan Turner (Swinburn University, Australia)

vendredi 28 juin 2024, 14:30 → 15:30 Europe/Paris

Amphi Recherche (LPCA)

Peculiar velocities are velocities imparted onto galaxies by the gravitational influence of their local environment, and so are uniquely suited to be optimal probes of the cosmic growth and the cosmic expansion of the local universe. With the release of datasets such as the SDSS Peculiar Velocity survey, and new datasets from DESI, WALLABY and 4HS on the horizon, we are in a golden age for peculiar velocity cosmology. I will discuss some recent results from our group including constraints on cosmological parameters obtained on the growth rate of large-scale structure with correlation measurements made with direct peculiar velocities from 6dFGS and SDSS and linear reconstructions of the local peculiar velocity field, which can in turn inform us about theories of modified gravity. Additionally, I will describe our investigations into how measurements of peculiar velocities may impact measurements of the Hubble constant made with gravitational wave standard sirens, and how we can use cosmological bursts such as fast radio bursts and Type Ia supernovae in tandem with peculiar velocities to tighten constraints on cosmological parameters.