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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-9358
DTSTART:20251117T190000Z
DTEND:20251117T203000Z
DTSTAMP:20260413T084035Z
LAST-MODIFIED:20251117T213032Z
LOCATION:Chamberlin 5280
SUMMARY:What is the QCD axion mass?\, Theory Seminar (High Energy/Cosm
 ology)\, Joshua N. Benabou\, UC\, Berkeley
DESCRIPTION:The QCD axion may solve the strong CP problem and constitu
 te the dark matter (DM) abundance in our Universe. Peccei-Quinn (PQ) a
 xions may form axion strings if the PQ phase transition occurs after i
 nflation. I will discuss recent advances in the computation of the QCD
  axion DM mass in this scenario from the most precise and accurate lat
 tice simulations to-date of axion-string networks\, leading to a predi
 cted mass range of 40 - 300 µeV. On the other hand\, string theory ax
 ions\, which are compelling solutions to the PQ quality problem\, do n
 ot generically form strings - except in special inflationary paradigms
  such as brane inflation - meaning that there is no unique predicted v
 alue for the QCD axion DM mass. Nonetheless\, if a Grand Unified Theor
 y is assumed\, I will explain why in broad regions of the string lands
 cape\, the mass of a stringy QCD axion is expected to be ~ 0.01 to 10 
 neV\, independently of its DM fraction. Video recording: https://youtu
 .be/3iLIDMX4FUs
URL:https://www.physics.wisc.edu/events/?id=9358
END:VEVENT
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