KIPAC Seminar: Probing the Late-Time Universe with CMB Secondary Anisotropies

Abstract: As cosmic microwave background (CMB) observations achieve higher angular resolution, secondary anisotropies, generated by the interaction of CMB photons with the intervening matter, are becoming some of the richest science targets of current and future surveys. Since these secondary signals predominantly appear on small angular scales, high-resolution CMB experiments are uniquely positioned to probe in detail the imprint of large-scale structure (LSS) on the CMB, providing a powerful complementary tracer to traditional LSS surveys. 

In this talk, I will describe my work extracting cosmological information from the late-time Universe using CMB secondary anisotropies and their cross-correlations with large-scale structure surveys. I will focus on measurements of the large-scale velocity field using the kinetic Sunyaev-Zel'dovich effect, including the development of a foreground-immune velocity reconstruction estimator and its application to data. I will then present measurements of structure growth at high redshift through the cross-correlation of CMB lensing and the Quaia quasar catalogue as well as measurements of primordial non-Gaussianity through the cross-correlation of CMB lensing and CIB. Finally, I will briefly discuss ongoing work using machine learning to recover non-Gaussian cosmological information from the thermal Sunyaev-Zel'dovich field.