In 1990, Sean Carroll’s, George Field and Roman Jackiw wrote an epochal paper that had a tremendous impact on physics, and in particular, on me and my career as a young graduate student in the 1990’s.

Recently, evidence for the parity violating effect from Cosmic Microwave Background observations by Planck was announced in Physical Review Letters: https://journals.aps.org/prl/accepted/b0070Yf9I0214c6835b00d89342658c8255c84496

Sean will discuss the background physics behind this effect and the implications for physics if the PRL is confirmed by upcoming polarimeters or otherwise convincing evidence is found. I will discuss some of the experimental challenges to making such a measurement and prospects for upcoming experiments such as CLASS, BICEP Array, SPT3G, Simons Array, ACT, LiteBIRD, Simons Observatory, and CMB Stage 4 to make a definitive, high confidence level claim. While you’re waiting for the livestream to start here is some homework

Sean Michael Carroll (born October 5, 1966) is a theoretical physicist specializing in quantum mechanics, gravity, and cosmology. He is a research professor in the Walter Burke Institute for Theoretical Physics in the California Institute of Technology Department of Physics.[1] He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as Nature as well as other publications, including The New York Times, Sky & Telescope, and New Scientist.

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