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BEGIN:VEVENT
DTSTAMP:20260919T170744Z
LAST-MODIFIED:20170329T183843Z
DTSTART:20170330T200000Z
DTEND:20170330T210000Z
UID:event1730@bu.edu
URL:http://physics.bu.edu/internal/events/show/1730
SUMMARY:Relaxion from particle production
DESCRIPTION:Featuring Gustavo Marques Tavares\, Stanford\n\nPart of the HET
	 Seminar Series.\n\nRecently a new solution to the hierarchy problem was pr
	oposed which makes use of the cosmological evolution of a light scalar fiel
	d\, a scanner\, instead of symmetry or anthropic arguments to select a smal
	l Higgs mass. In the original proposal this scanner field could be the QCD 
	axion and thus such class of solution became known as ``relaxion’’. Two
	 central features required of the relaxion are a reason for why a small Hig
	gs mass is special from the scanner’s viewpoint and a mechanism fo the sc
	anner to dissipate its energy in order to stop in a value associated with s
	mall Higgs mass. In this talk we propose a novel mechanism that achieves bo
	th goals and opens new possibilities for the relaxion. We show that particl
	e production can create an effective friction force for the relaxion and sh
	ow how it can be used to ``select’’ the TeV scale as a special energy s
	cale from reasonable initial conditions. This allows for the scanning to ha
	ppen much faster than in previous relaxion models\, which usually require v
	ery large amounts of inflation\, and also allows for the scanning to take p
	lace after inflation has ended.
LOCATION:PRB 565\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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