Speaker
Description
CMB data are fundamentally projected, with intricate secondary anisotropies each revealing distinct chapters of cosmic evolution. In a series of 6 papers, we carry out a deeply data-intensive cross-correlation tomography of CMB secondaries, jointly analyzing billions of HEALPix pixels across dozens of diffuse sky maps (e.g., Planck, IRAS, Herschel) and spectroscopic galaxies tracing large-scale structure. This unified effort provides a census of the cosmic baryon inventory across 12 Gyr of history. Key results include: (1) measuring the cosmic thermal energy history Ω_th in hot gas through the SZ effect, with implications for gravitational energy release Ω_grav; (2) reconstructing the most precise cosmic star formation history to date via 11-band CIB tomography with fully constrained SEDs over 90% of cosmic time; (3) tracing the evolution of cosmic dust abundance Ω_dust; (4) revealing CIB leakage in Galactic dust maps and developing a new field-level, 3D component separation method, producing the clean “CSFD” dust map; and (5) the first detections of CO and [CII] line backgrounds, probing the molecular gas density Ω_H2 and the cosmic cooling budget. Together, these results point toward a future of end-to-end, multi-wavelength sky analysis in which diffuse backgrounds become precision probes of cosmic evolution.