Galaxy and peculiar velocity clustering analysis to constrain Dark Energy
by
C7b/058 - Seminar
IFAE Main Building C7b
Spectroscopic galaxy surveys have become indispensable for probing the accelerated expansion of the Universe and testing models of Dark Energy and modified gravity. Measuring the galaxies peculiar velocity offer a complementary probe for the growth rate of structure $f\sigma_8$ and the underlying matter distribution. Recent studies demonstrate that cross-correlating these observables significantly improves the precision of growth rate measurements.
In this talk, I explore the potential of combining galaxy and peculiar velocity clustering on non-linear scales to enhance cosmological constraints. Leveraging the AbacusSummit simulation suite and the halo occupation distribution framework, I present emulator models that accurately describe the non-linear clustering of galaxies and velocities in redshift space, achieving a 20% improvement in constraints on $f\sigma_8$.