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Joint Theory Seminar: Anson Hook

Description Speaker: Anson Hook
Email: hook@umd.edu
Title: Aharonov-Bohm in the Sky : A CMB Millikan Experiment with Cosmic Axiverse Strings
Zoom: https://zoom.us/j/186024391
Host: Markus Luty

Abstract: We show that photons moving around an axion string coupled to photons undergo an Aharonov-Bohm effect. As a result, axion strings produce a distinct quantized polarization rotation of CMB photons which can be as large as O(1%). As the CMB passes many strings, this polarization rotation converts E-modes to B-modes and adds up like a random walk. We show that the expected size of the final result is well within the reach of current and future CMB experiments. The quantized polarization rotation angle is topological in nature and its value provides insight into the quantization of electric charge.
Date Mon, February 22, 2021
Time 1:30pm-2:30pm PST
Duration 1 hour
Access Public
Created by High-Energy Seminars
Updated Thu, January 21, 2021 10:52am PST
Send Reminder Yes  -  0 days 8 hour 0 minutes before start

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