Cosmological measurements with unequal time galaxy correlations

Current and forthcoming cosmological surveys will provide measurements of galaxy clustering with unprecedented precision. This means that data will need to be compared to theoretical predictions of comparable accuracy. Currently, the statistical modeling used to analyze data makes use of several simplifying assumptions, aimed at reducing computational complexity, but at the risk of reducing the accuracy. In this thesis we investigate the impact of unequal time measurements of 2point galaxy correlations and how this could affect cosmological model testing for future galaxy surveys.