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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1583
DTSTART:20091029T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T030859Z
LAST-MODIFIED:20091028T133012Z
LOCATION:4274 Chamberlin
SUMMARY:The low-down on Ultrahigh Energy Cosmic Rays:  experimental re
 sults and theoretical puzzles\, NPAC (Nuclear/Particle/Astro/Cosmo) Fo
 rum\, Glennys Farrar\, New York University
DESCRIPTION:Observed properties of UHECR showers are difficult to reco
 ncile with simulated showers and arrival direction information\, and n
 o choice of composition seems compatible with all observations.  At th
 e moment\, one or more improbable or very improbable statistical fluct
 uations\, or a new physics threshold at about 100 TeV\, seem to be the
  only viable explanations.   I will also describe new\, much better co
 nstraints on the Galactic Magnetic Field.  The proposal that a large f
 raction of UHECRs may come from Centaurus A -- which\, at about 3.5 Mp
 c is the closest plausible source -- can be excluded\, unless extragal
 actic magnetic fields are much larger than generally thought.
URL:https://www.physics.wisc.edu/events/?id=1583
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