High-precision CMB lensing measurements with the Atacama Cosmology Telescope: a new probe of cosmology and fundamental physics

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• Frank J. Qu (DAMTP)
• Tuesday 02 May 2023, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Inigo Zubeldia.

Dark matter not only provides the invisible scaffolding from which the birth of galaxies takes place, but by studying its distribution in our universe we can infer a great deal of information regarding the growth of structure and cosmic expansion. Measuring the gravitational lensing of the CMB allows the mapping of all the matter distribution (for which the majority is dark matter) to very high redshifts, providing a clean window for constraining fundamental physics. In this talk, I will present new CMB lensing measurements derived from data release 6 of the Atacama Cosmology Telescope, which provides a state-of-the-art lensing power spectrum measurement of 43 \sigma and an associated signal-dominated lensing mass map that will enable a host of cosmological and astrophysical science goals. I will discuss in detail the novel methods used to tackle key systematics affecting precision CMB lensing and explore the implications of our measurements in the context of structure growth and how it can weigh in on the S8 tension.

This talk is part of the Cosmology Lunch series.

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