WI Seminar with Susanna Azzoni
Dec
2
2025
Dec
2
2025
Description
Abstract: Modern multi-platform, multi-band millimeter-wavelength surveys are transforming our ability to explore the origin and evolution of the Universe. The new generation of cosmic microwave background (CMB) experiments, including the Simons Observatory (SO), will tackle key scientific questions with unprecedented sensitivity. A primary target is the faint large-scale B-mode polarization of the CMB, a unique signature of primordial gravitational waves and high-energy physics in the early Universe. Observing this signal requires precise control of instrumental systematics and a clear understanding of how noise correlations, calibration uncertainties, and sky-induced signals propagate from raw data to cosmological parameters. Over the past year, the mid-frequency SO Small Aperture Telescopes have undergone extensive on-sky testing. I will present preliminary results, including polarization maps and spectra at 90/150 GHz, and walk through how raw telescope data is transformed into some of the most sensitive maps of the microwave sky. Finally, I will highlight the key challenges faced by our analysis, including the contamination from B-mode-emitting Galactic foregrounds, and outline strategies to ensure robust constraints on the early Universe.
Audience
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