Speaker
Description
The South Pole Telescope (SPT), a 10-meter telescope optimized for observing the primary and secondary anisotropies of the cosmic microwave background (CMB), is currently equipped with the SPT-3G camera. The high angular resolution and low noise maps produced by SPT-3G are ideally suited for reconstructing the CMB lensing potential, mapping matter distribution to high redshifts, and probing fundamental physics. This talk presents results from the SPT-3G lensing analysis using data from 1500 deg² over the Southern Sky collected during the 2019 and 2020 seasons. Our analysis employs the improved global minimum variance estimator, reducing noise by up to 10% compared to the standard quadratic estimator and achieving a statistical uncertainty on the lensing amplitude of about 2%. The resulting map, the deepest to date, is signal-dominated out to L ~ 400, with significant contributions from polarization. This high-sensitivity map will provide critical insights into cosmic structure growth and neutrino masses. We plan to cross-correlate this map with external datasets to extract cosmological and astrophysical information and use it to delens BICEP/Keck data, thereby sharpening constraints on primordial gravitational waves. This analysis marks significant progress in CMB lensing measurements, which have evolved from early detections to one of the most powerful cosmological tools in less than two decades.
| Would you be interested in presenting a poster if the conference is oversubcribed? | No |
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