Weinberg Institute Seminar: Unequal-time effects in the galaxy two-point correlation function

The study of galaxy clustering is about to enter its most fruitful era. The large-scale structure of the Universe will be mapped with unprecedented precision by upcoming galaxy surveys, and this calls for a matching level of accuracy in the theoretical modeling of the observables, such as the two-point correlation function of galaxy pairs.
Many of the simplifying assumptions, that were employed for past surveys, will not be applicable anymore, as they might lead to biased results on cosmological parameters.
One of these assumptions consists in taking all galaxies within a redshift bin to be located at the same radial distance, thus effectively flattening the bin at the mean redshift, while in general there is some unequalness-in-time between the two objects being correlated.
A novel formalism has recently been proposed to account for unequal-time corrections in the two-point correlations, by including the information on the radial Fourier modes.
In this talk I give an overview of the formalism and of the new observables based on it, and I discuss the relevance of unequal-time corrections for future surveys.

Bio: I am currently a Postdoc at Tel Aviv University and Ben-Gurion University, working on cosmology, in particular on the large-scale structure of the Universe and dark matter. I obtained my PhD from the University of Padova in 2024, under the supervision of Profs. Alvise Raccanelli and Nicola Bartolo. I will be visiting UT Austin until mid-March.