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SUMMARY:Anson Hook (U. Maryland)
DTSTART:20201026T150000Z
DTEND:20201026T160000Z
DTSTAMP:20260423T003253Z
UID:IFTWeb/13
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/IFTWeb/13/">
 Aharonov-Bohm in the Sky : A CMB Millikan Experiment with Cosmic Axiverse 
 Strings</a>\nby Anson Hook (U. Maryland) as part of IFT-Madrid Webinars\n\
 n\nAbstract\nWe show that photons moving around an axion string coupled to
  photons undergo an Aharonov-Bohm effect.  As a result\, axion strings pro
 duce a distinct quantized polarization rotation of CMB photons which can b
 e as large as O(1%).  As the CMB passes many strings\, this polarization r
 otation converts E-modes to B-modes and adds up like a random walk.  We sh
 ow that the expected size of the final result is well within the reach of 
 current and future CMB experiments.  The quantized polarization rotation a
 ngle is topological in nature and its value provides insight into the quan
 tization of electric charge.\n
LOCATION:https://researchseminars.org/talk/IFTWeb/13/
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