Research Seminars @ Illinois

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Tailored for undergraduate researchers, this calendar is a curated list of research seminars at the University of Illinois. Explore the diverse world of research and expand your knowledge through engaging sessions designed to inspire and enlighten.

To have your events added or removed from this calendar, please contact OUR at ugresearch@illinois.edu

Astrophysics, Relativity, and Cosmology Seminar - Yunyang Li (University of Chicago) "Largest angular scale CMB polarization measurement with CLASS"

Event Type: Seminar/Symposium
Sponsor: Department of Physics
Location: Rhondale Tso Seminar Room, Loomis 236
Virtual: Join online
Date: Sep 24, 2025 11:00 am
Speaker: Yunyang Li (University of Chicago)
Contact: Deanna Frye
E-Mail: ddebord@illinois.edu
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Originating Calendar: Physics - Astrophysics, Relativity, and Cosmology Seminar; The polarization of the cosmic microwave background (CMB) provides complementary information to its primary anisotropy and is the frontier of ongoing and future CMB experiments. In particular, the large-scale CMB polarization encodes unique insights into inflationary modes and cosmic reionization. Despite significant advances in telescope design and detector technology, measuring the largest angular scales of the CMB remains challenging for ground-based experiments. In this talk, I will present the design and technological innovations of the Cosmology Large Angular Scale Surveyor (CLASS), showcasing its success in overcoming these challenges. I will discuss initial results from the 40 and 90 GHz surveys and highlight its first detection of the reionization signal from the ground.

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