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SUMMARY:[CANCELLED] Screening of fifth forces in scalar tensor theories - 
 Clare Burrage\, University of Nottingham
DTSTART:20201202T141500Z
DTEND:20201202T151500Z
UID:TALK153412@talks.cam.ac.uk
CONTACT:Scott Melville
DESCRIPTION:Scalar tensor theories are of interest as possible explanation
 s for the acceleration of the expansion of the universe\, and also as a wa
 y to understand possible modifications of gravity. However\, it is always 
  necessary to explain why\, if such a theory describes our universe\, a sc
 alar mediated fifth force has not been seen. I will discuss two possible e
 xplanations for this: (1) that the underlying physical theory is scale inv
 ariant and (2) that non-linearities in the theory act to suppress\, or 'sc
 reen' the fifth force.  I will focus\, in particular\, on the challenges e
 ncounter when trying to embed these mechanisms in effective field theories
 .
LOCATION:ONLINE - Details to be sent by email
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