Physics Colloquium with Andrina Nicola on Holistic Cosmological Analyses

Andrina Nicola (Hosted by Krawczynski) from Princeton University will be presenting the colloquium "Towards Holistic Cosmological Analyses"

Recent progress in observational cosmology and the establishment of ΛCDM have relied on the combination of different cosmological probes. These probes are not independent, since they all measure the same physical fields. The resulting cross-correlations allow for a robust test of the cosmological model through the consistency of different physical tracers and for the identification of systematics. Integrated analyses taking into account both the auto- as well as the cross-correlations between probes therefore present a promising analysis method for both current as well as future data.

Observational cosmology is currently undergoing transformational changes, as a number of high-precision, wide-field surveys will start operations in the mid- to late 2020s; examples include Rubin/LSST, Euclid, Roman and the Simons Observatory. These surveys will give us the opportunity to test the foundations of our cosmological model. However, the increase in survey sensitivity implies that controlling systematic biases and uncertainties will become the main challenge in their analysis, therefore requiring novel data analysis methods.

In this talk, I will present an integrated analysis of CMB temperature anisotropies, CMB lensing, galaxy clustering and weak lensing. I will then lay out the path towards extending joint analyses to optimally benefit from upcoming data. These novel analysis methods will rely heavily on Machine Learning and Artificial Intelligence, thus allowing us to derive robust and unbiased constraints on our cosmological model, exploiting the additional information contained in the non-linear features of cosmic fields. This will be crucial for probing the fundamental pillars of ΛCDM using current and future surveys. 

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