Astro Seminar Series - VIA ZOOM

Wednesday, January 19, 2022 11:30 am - 11:30 am EST (GMT -05:00)

Carolina Cuesta Lazaro
Carolina Cuesta Lazaro is a final year PhD student at Durham University working on Large Scale Structure modelling. She is interested in extracting as much cosmological information as possible from galaxy surveys to constrain General Relativity. Lately, she has been working on emulators for galaxy two-point correlation functions and developing Machine Learning techniques at the field level.

Talk Title and Abstract 

Redshift surveys in a nutshell, learning summary statistics with machine learning

Cosmologists have encountered one of the biggest mysteries in physics: the Universe is expanding in an accelerated manner. Can we reconcile this observation with Einstein’s general relativity, or should we find alternative theories? To answer this question, we build large three-dimensional maps of the Universe, whose statistical properties depend on the underlying laws of gravity. Traditional approaches to analyze these datasets have relied on summarising the rich, but noisy, three-dimensional information with N-point statistics. But can we extract all the cosmological information contained in these summaries? And how much extra information that is useful to constrain cosmology and gravity is missing in the summaries? In this talk I will present my research on simulation-based techniques to infer cosmological parameters from two-point statistics in redshift space galaxy surveys. Moreover, I will introduce my plan to design machine learning methods that optimally constrain cosmology by learning summary statistics from N-body simulations.

Would you like to join this Zoom seminar?  Please email WCA.