Speaker: Takada Masahiro (IPMU)

Title: Towards robust cosmology with large-scale structure probes

Abstract:  
The ongoing and upcoming wide-area galaxy surveys including Subaru HSC/PFS and Euclid allow for high-precision measurements of large-scale structure probes such as weak lensing and galaxy clustering, which enables us to address the fundamental questions in cosmology such as the origin of cosmic acceleration, the nature of dark matter and the neutrino mass. However, to attain the full potential of galaxy surveys, we need to have a good control of uncertainties in observational systematic errors and physical systematic effects. One of the most important uncertainties is an unknown relation between distributions of matter and galaxies, so-called galaxy bias uncertainty. In this talk, I will describe the approach our team in Japan is taking; an emulator project allowing for fast, accurate computations of halo statistical quantities (halo mass and halo correlation functions) for an input cosmological model, the cosmology challenge project, and the intrinsic alignments as a probe of cosmology. This is for making robust cosmology from high-precision clustering observables, protecting the cosmological constraints against systematic effects.