Modelling the power spectrum on the light cone & preparing for the 4MOST redshift survey
Wed 20th Nov 2019 @2:15 PM, level 7, David Caro Building
This talk is broken into two parts:
– The power spectrum is a powerful tool for measuring the large scale structure of the universe, and contains a wealth of cosmological information. As upcoming ’stage IV’ cosmology redshift surveys will map out the distribution of galaxies with a higher precision, and in a much larger survey volume than previous projects, it is important to review how the power spectrum is modelled and estimated. After going through a very brief review of large scale structure cosmology and two point statistics, I will give an overview of my work on how to accurately model the power spectrum when such large volumes are considered. I will give a particular focus to unequal-time correlators, and what the effect of using “effective redshift” approximations can have on the power spectrum amplitude.
– In the second part of my talk I will give an overview of the upcoming 4MOST cosmology redshift survey, due to launch in 2022. I will then discuss the ongoing development of the power spectrum estimation pipeline that will be used to test the mock catalogues for the survey, and how these can help for forecasting and survey design.