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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4393
DTSTART:20170321T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T075848Z
LAST-MODIFIED:20170322T022721Z
LOCATION:5280 Chamberlin
SUMMARY:Relaxion from particle production\, Theory Seminar (High Energ
 y/Cosmology)\, Gustavo Marques Tavares\, Stanford University
DESCRIPTION:Recently a new solution to the hierarchy problem was propo
 sed which makes use of the cosmological evolution of a light scalar fi
 eld\, a scanner\, instead of symmetry or anthropic arguments to select
  a small Higgs mass. In the original proposal this scanner field could
  be the QCD axion and thus such class of solution became known as ``re
 laxion’’. Two central features required of the relaxion are a reas
 on for why a small Higgs mass is special from the scanner’s viewpoin
 t and a mechanism fo the scanner to dissipate its energy in order to s
 top in a value associated with small Higgs mass. In this talk we propo
 se a novel mechanism that achieves both goals and opens new possibilit
 ies for the relaxion. We show that particle production can create an e
 ffective friction force for the relaxion and show how it can be used t
 o ``select’’ the TeV scale as a special energy scale from reasonab
 le initial conditions. This allows for the scanning to happen much fas
 ter than in previous relaxion models\, which usually require very larg
 e amounts of inflation\, and also allows for the scanning to take plac
 e after inflation has ended.
URL:https://www.physics.wisc.edu/events/?id=4393
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