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Speaker: Frank Qu (Cambridge University) – Title: Cosmology from high-precision CMB lensing measurements with the Atacama Cosmology Telescope
May 18, 2023 @ 4:00 pm - 5:00 pm
This is an In-Person [HYBRID] Event
Date: MAY 18, 2023
Location: Sessler Conference Room – 50A-5-5132
SPEAKER: Frank Qu (Cambridge University)
TITLE: Cosmology from high-precision CMB lensing measurements with the Atacama Cosmology Telescope
ABSTRACT:
The cosmic microwave background provides a unique backlight for illuminating the growth of structures in our universe. Measuring the arcminute-scale lensing deflections experienced by the CMB photons as they travel to our telescopes enables the mapping of the matter distribution to very high redshifts. This lensing signal provides a clean window for constraining fundamental physics, such as the sum of neutrino masses, and enables powerful tests of the standard cosmological model via comparison of high-precision measurements of structure growth at late times with early-time predictions.
In this talk, I will present new CMB lensing measurements derived from data release 6 of the Atacama Cosmology Telescope. Our work provides a state-of-the-art lensing power spectrum measurement and an associated signal-dominated lensing mass map that enable a host of cosmological and astrophysical science goals. I will first discuss the novel methods used to tackle key systematics affecting precision CMB lensing. I will then explore the implications of our measurements for tests of cosmic structure growth and the S8 tension.
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https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239