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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3886
DTSTART:20170331T203000Z
DTEND:20170331T213000Z
DTSTAMP:20260414T050838Z
LAST-MODIFIED:20170328T143154Z
LOCATION:2241 Chamberlin Hall
SUMMARY:The Dark Matter in the Universe\, Physics Department Colloquiu
 m\, Katherine Freese\, University of Michigan
DESCRIPTION:"What is the Universe made of?” This question is the lon
 gest outstanding problem in all of modern physics\, and it is one of t
 he most important research topics in cosmology and particle physics to
 day. The bulk of the mass in the Universe consists of a new kind of da
 rk matter particle\, and the hunt for its discovery in on. I'll start 
 by discussing the evidence for the existence of dark matter in galaxie
 s\, and then show how it fits into a big picture of the Universe conta
 ining 5% atoms\, 25% dark matter\, and 70% dark energy.  Leading candi
 dates for the dark matter are Weakly Interacting Massive Particles (WI
 MPs)\, a generic class of particles that are electrically neutral and 
 do not participate in strong interactions\, yet have weak-scale intera
 ctions with ordinary matter. There are three approaches to experimenta
 l searches for WIMPS: at the Large Hadron Collider at CERN in Geneva\;
  in underground laboratory experiments\; and with astrophysical search
 es for dark matter annihilation products such as with the IceCube dete
 ctor at the South Pole. Currently there are claimed detections in mult
 iple experiments --- but they cannot possibly all be right.   The resu
 lts are puzzling and the hints of detection will be tested soon.  At t
 he end of the talk I'll turn to dark energy and its effect on the fate
  of the Universe.
URL:https://www.physics.wisc.edu/events/?id=3886
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