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SUMMARY:Hunting for Chameleons - Amanda Weltman DAMTP (University of Cambr
 idge)
DTSTART:20080222T130000Z
DTEND:20080222T140000Z
UID:TALK9654@talks.cam.ac.uk
CONTACT:David Seery
DESCRIPTION:Self interacting scalar fields coupled to matter\, known as ch
 ameleon fields\, can explain the accelerating expansion of the universe wh
 ile evading current fifth force constraints. In this talk we review chamel
 eon cosmology and discuss the observable effects of such fields for experi
 ments in space and on earth. In particular we will see how strongly couple
 d chameleons open up the possibility for testing a large range of paramete
 r space in table top type experiments on earth. The GammeV experiment\, in
  its current configuration\, is a search for cosmologically interesting ch
 ameleons that couple to photons as well as to baryonic matter. Chameleons 
 generated through electromagnetic interactions\, in a closed chamber conta
 ining a magnetic field\, will remain confined to that chamber due to their
  matter interactions. These particles will gradually decay to photons\, pr
 oducing an "afterglow'' effect which is a unique signature of chameleons.
LOCATION:Pavilion B Potter Room (B1.19)
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