CFHT UM2019 - Presentation Details

Abstract Details

Title: The MSE high-z Cosmology Survey

Presenter: Will Percival


The MaunaKea Spectroscopic Explorer (MSE) has the potential to perform a cosmologically focussed galaxy redshift survey over a large volume of the Universe (280 Gpc^3), with a galaxy density sufficient to measure the extremely-large-scale density fluctuations required to explore primordial non-Gaussianity and therefore inflation. We present the MSE High-z Cosmology Survey, which will provide a measurement of the level of non-Gaussianity as parameterized by the local parameter f_nl to a precision /-1.8. Combining the MSE High-z Cosmology Survey with data from a next generation CMB stage 4 experiment and existing DESI data will provide the first 5sigma confirmation of the neutrino mass hierarchy from astronomical observations. Only combining the data from the MSE High-z Cosmology Survey together with Planck provides a 4sigma neutrino mass measurement. In addition, the Baryonic Acoustic Oscillations (BAO) observed within the sample will provide measurements of the distance-redshift relationship in six different redshift bins between z=1.6 and 4.0, each with an accuracy of ~0.6%. These high-redshift measurements will provide a probe of the Dark Matter dominated era and test exotic models where Dark Energy properties vary at high redshift. The simultaneous measurements of Redshift Space Distortions (RSD) at redshifts where Dark Energy has not yet become important directly constrain the amplitude of the fluctuations parameterized by sigma_8, at a level ranging from 1.9% to 3.6% for the same redshift bins.