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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-9086
DTSTART:20250512T180000Z
DTEND:20250512T193000Z
DTSTAMP:20260413T151542Z
LAST-MODIFIED:20250512T192150Z
LOCATION:Chamberlin 5280
SUMMARY:Axion couplings as UV probes\, Theory Seminar (High Energy/Cos
 mology)\, Michael Nee\, Harvard University
DESCRIPTION:The couplings of axions to gauge bosons are highly restric
 ted in Grand Unified Theories and heterotic string models. The topolog
 ical nature of these couplings allows them to be matched from the UV t
 o the IR\, and the ratio of the anomaly with photons and gluons for an
 y axion is fixed by UV physics. This implies that in these theories th
 ere is a single axion\, the QCD axion\, with an anomalous coupling to 
 photons. Other light axion-like particles can couple to photons by mix
 ing through the QCD axion portal and lie to the right of the QCD line 
 in the mass-coupling plane. A discovery of an axion to the left of the
  QCD line can rule out unified theories and some heterotic models. Axi
 on experiments are therefore probes of unification and string theory. 
 Event recording: https://youtu.be/e5oPhacsBeg
URL:https://www.physics.wisc.edu/events/?id=9086
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