Speaker
Description
The weak gravitational lensing of the cosmic microwave background photons due to the line-of-sight matter distribution is a powerfully precise probe of cosmology. One of the key insights that this phenomenon known as CMB lensing unveils is an unbiased mapping of dark matter and its characteristics, allowing us to trace the formation and growth of large-scale structure over vast cosmic epochs. In this talk, I will demonstrate how I’ve used CMB lensing maps from the Atacama Cosmology Telescope (ACT) and the Planck satellite with two different approaches to constrain structure growth. After briefly discussing my past work cross-correlating ACT Data Release 6 (DR6) + Planck CMB lensing with the spectroscopic luminous red galaxies from the Dark Energy Spectroscopic Instrument (DESI), I will present ongoing efforts in measuring one of the highest significance detections of the CMB lensing power spectrum using the final data release of ACT. I will highlight improvements from the DR6 analysis, such as the novel usage of daytime observations and improved techniques to process CMB data jointly with Planck, and showcase preliminary constraints on the structure growth parameter $S_8^{\rm CMBL}$. Finally, I will interpret these state-of-the-art CMB lensing constraints in context to the “S8 tension” between early-time predictions of structure growth and late-time observables, as well as mentioning the outlook for future CMB lensing analyses.
| Would you be interested in presenting a poster if the conference is oversubcribed? | Yes |
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