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SUMMARY:Acausality in Massive Gravity:  Problems and (Attempted) Solutions
  - McCullen Sandora (CP3 Origins)
DTSTART:20150213T130000Z
DTEND:20150213T140000Z
UID:TALK57450@talks.cam.ac.uk
CONTACT:Benson Way
DESCRIPTION:I will discuss the problem of acausal signal propagation in th
 e class of nonlinear massive gravity models recently constructed by de Rha
 m\, Gabadadze and Tolley.  Though these models successfully maintain the c
 orrect number of degrees of freedom\, and thus evade a generic pitfall of 
 nonlinear massive gravities\, I argue that acausality is an equally pressi
 ng issue that needs to be resolved.  A few extensions to the model trying 
 to circumvent this are presented\, but the successful construction of a ca
 usal massive gravity theory is left as a challenge for the audience.
LOCATION:Pavilion B Potter Room (B1.19)
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