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SUMMARY:Supersymmetric Chameleons - Jeremy Sakstein (DAMTP)
DTSTART:20121207T130000Z
DTEND:20121207T140000Z
UID:TALK41394@talks.cam.ac.uk
CONTACT:Ivan Agullo
DESCRIPTION:Screened modified gravity such as chameleon and symmetron grav
 ity is a viable alternative to quintessence when addressing problems such 
 as dark energy. To date\, these theories have been largely phenomenologica
 l and few attempts at unifying them with the rest of particle physics has 
 been made. Furthermore\, these models generically require a cosmological c
 onstant in order to match observations. In this talk I will describe recen
 t progress towards addressing these issues by presenting a globally supers
 ymmetric framework for describing the low-energy behaviour of these theori
 es. The inclusion of supersymmetry leads to strong restrictions on the typ
 es of models that are viable and I will describe these new features\, whic
 h include density-dependent supersymmetry breaking and SUPER-screening. A 
 cosmological constant emerges naturally within this framework at low cosmo
 logical densities. This framework can tell us a lot about potential UV com
 pletions of such theories\; which ones are viable and\, more importantly\,
  which are not.
LOCATION:Pavilion B Potter Room (B1.19)
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