Primordial Non-Gaussianity from Galaxy Surveys

Project Description:

Galaxy surveys give us information about the distribution of galaxies in the Universe and the galaxy distribution contains information about the initial conditions of the Universe. One of the most important signatures we can search for is primordial non-Gaussianity(PNG), which arises from the physics of inflation in the very early Universe. Measuring PNG can give vital information about inflationary models and discriminate between different theories of the early Universe. This project will investigate the observational signatures of primordial non-Gaussianity in galaxy surveys, focusing on how it affects the galaxy distribution through scale-dependent bias and how current and future surveys can constrain PNG. The project involves both theoretical and computational work. With guidance and support, you will explore properties of the galaxy distribution, including the galaxy power spectrum, and investigate the effects of local non-Gaussianity (fNL) on large-scale structure. Particular attention will be given to the unique advantages of HI intensity mapping with SKA for probing ultra-large scales where PNG signatures are strongest, as well as the multi-tracer technique which uses multiple galaxy populations to reduce cosmic variance and improve constraints on fNL. Students will learn Fisher forecast techniques for constraining fNL parameters and assessing the constraining power of different survey configurations.

Research Area:

Astrophysics

Project Level:

Masters

This Project Is Offered At The Following Node(s):

(UCT)(UKZN)(NWU)

Special Requirements:

Cosmology and Computational Physics/Astrophysics