Sven’s (UCSC) scientific journey has been shaped by trying to ensure accurate and precise results from weak lensing surveys. His contributions to this field are both direct investigations of potential systematic biases (such as variable survey depth) as well as the establishment of higher-order lensing statistics (persistent homology and third-order shear statistics, in collaboration with Pierre) for a robust cosmological inference. As a member of DESI, he performed the validation of Galaxy Lensing measurements for subsequent cosmological analyses.
Title: Probing the Dark Sector: Implications of DESI's Dynamic Dark Energy Results
Abstract: Recent findings from the Dark Energy Spectroscopic Instrument (DESI) consistently favor a dynamic dark energy model. This poses a significant challenge, as the favored parameters are inconsistent with simple physical models, suggesting a more complex dark sector is at play. This presentation analyzes these DESI results and their implications for cosmology. We will then evaluate strategies to sharpen constraints on dark energy models and conclude by addressing the critical challenge of breaking potential dark degeneracies.