Beyond the CMB power spectrum with the Atacama Cosmology Telescope

Adriaan Duivenvoorden (CCA Flatiron)

June 22, 2023

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Abstract: The Atacama Cosmology Telescope (ACT) collaboration is preparing to release the results of a 6-year-long survey covering 40% of the microwave sky at arcminute resolution. The dataset provides a vast jump in sensitivity compared to previous ACT data releases and will deliver some of the strongest constraints on the cosmological parameters and extensions to the Lambda-CDM model. In this talk I will focus on science cases that go beyond the usual Cosmic Microwave Background (CMB) power spectrum analysis. After a brief introduction I will give an overview of our recently released CMB lensing results and discuss implications for the growth of structure. I will then discuss a novel conjugate-gradient based technique that will allow optimal inference from the sky maps themselves, important for the study of e.g. CMB lensing and primordial non-Gaussianity. Finally, I will briefly advertise ACTs upcoming maps of the spectral distortions due to galaxy clusters.