IPMU Colloquium

Speaker: Kazuyuki Akitsu (Kavli IPMU)
Title: Probing angular-dependent primordial non-Gaussianity from galaxy intrinsic alignments (Posdoc Colloquium)
Date (JST): Fri, Dec 18, 2020, 15:30 - 16:00
Place: Zoom
Related File: 2603.pdf
Abstract: The primordial non-Gaussianity (PNG) is a key feature to screen various inflationary models and it is one of the main targets in the next generation galaxy surveys. In particular, the local-type of PNG makes the galaxy bias scale-dependent in large-scales, which is known as the scale-dependent bias, allowing to constrain the local-type PNG from galaxy surveys. In this talk, I will present the usefulness of the galaxy shape correlation, called the ``intrinsic alignment’’, as the probe of the angular-dependent PNG. Using N-body simulations, I show the angular-dependent PNG induces the scale-dependent bias in the intrinsic alignment, just as the angular-independent PNG leads to the scale-dependent bias in the galaxy number density correlation. By combining photometric and spectroscopic surveys to measure the intrinsic alignment, future galaxy surveys are capable to constrain the angular-dependent PNG better than CMB experiments.
Remarks: IPMU Postdoc Colloquium Series 22
Registration necessary from here: https://ipmu.zoom.us/webinar/register/WN_SiQNqIjNSfCUiA0na9o58g