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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-4635
DTSTART:20171003T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260307T002339Z
LAST-MODIFIED:20171117T173859Z
LOCATION:5280 Chamberlin
SUMMARY:Topics in Axion Cosmology\, Theory Seminar (High Energy/Cosmol
 ogy)\, Andrew Long\, KICP/University of Chicago
DESCRIPTION:(Which topics?  The interesting ones!)  Light pseudo-Golds
 tone bosons arise in many compelling models of particle physics and st
 ring theory.  These particles can modify cosmology in interesting\, su
 rprising\, and testable ways.  In this talk I will discuss three topic
 s.  First I’ll argue that the dynamics of an axion field during infl
 ation can give rise to the matter / antimatter asymmetry of the univer
 se via the production of helical magnetic fields (which persist today 
 and might be detectable!).  Second\, I’ll discuss what goes wrong wh
 en you try to implement the same idea with chiral gravitational waves 
 instead of magnetic fields.  Finally\, I’ll talk about new phenomena
  that arise in multi-axion models\, such as the recent proposed `clock
 work’ axion\, that have a large hierarchy between the scale of PQ-br
 eaking and the axion decay constant. 
URL:https://www.physics.wisc.edu/events/?id=4635
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