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SUMMARY:Dark energy in the lab - Benjamin Elder\, University of Nottingham
  
DTSTART:20200427T120000Z
DTEND:20200427T130000Z
UID:TALK141379@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:The accelerated expansion of the universe hints at the existen
 ce of a new light degree of freedom in the gravitational sector.  Such a d
 egree of freedom\, generally taken to be a scalar\, mediates a fifth force
  between matter particles.  This property is in tension with existing test
 s of gravity\, unless the fifth force is screened\, i.e. it dynamically we
 akens in certain environments\, such as the Solar System.  A new generatio
 n of gravitational experiments\, being performed in the laboratory\, are d
 esigned to be sensitive to screened forces\, and have made great headway t
 owards detecting or ruling out screened forces over the past several years
 .  In this talk I will focus on how atom interferometry in particular has 
 resulted in strong new bounds on one of the simplest and most popular mode
 ls of screened dark energy\, the chameleon.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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