Oral Presentation

Subaru PFS Cosmology Program

Author(s): Tomomi Sunayama

Presenter: Tomomi Sunayama (ASIAA)

With about 100 nights of the cosmology program of the Subaru Prime Focus Spectrograph (PFS) survey, we aim to achieve two major goals: (1) To rule out the inverted hierarchy of neutrino masses by measuring <0.1eV at the 95% CL, or to determine the total mass of neutrinos if < 0.1eV; and (2) To rule out the standard Cold Dark Matter (CDM) paradigm by finding a time evolution of dark energy density (thus ruling out the cosmological constant Lambda) or finding evidence for a correction to General Relativity (GR) on cosmological scales, or to confirm CDM with unprecedented precision.
We will achieve these goals by mapping out cosmological distance, the expansion rate of the Universe, and the growth rate of matter density fluctuations as a function of redshift, with a few percent uncertainties in seven redshift bins across z=0.6 to z2.4. The wide redshift coverage of the PFS SSP cosmology survey enables powerful internal consistency checks for robustly testing the cosmological models and will be complementary to DESI and Euclid since measuring ELGs at z=2-2.4 is currently only possible by the PFS.