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SUMMARY:Parametrising general linear cosmological perturbations - Macarena
  Lagos (Imperial College)
DTSTART:20161031T130000Z
DTEND:20161031T140000Z
UID:TALK67653@talks.cam.ac.uk
CONTACT:Rupert Allison
DESCRIPTION:We have great certainty on how gravity works around our solar 
 system: General Relativity (GR) has been found to be very accurate at thes
 e small scales. On large scales though\, the LCDM model is in good agreeme
 nt with cosmological data\, but relies on the presence of several unknown 
 components\, whose origin and nature are not yet understood. For this reas
 on\, it is important to test the validity of GR on cosmological scales.\n\
 nIn this talk I will show a method to parametrise deviations from GR at la
 rge scales. Ultimately\, the objective is to use experimental data to cons
 train the free parameters in the model and\, as result\, test GR and ident
 ify possible viable modifications that will help us understand better grav
 ity in this regime. The method I will show is general and systematic\, and
  allow us to construct the most general quadratic action for linear cosmol
 ogical perturbations\, given some field content and gauge symmetries. It i
 s possible to apply the method to obtain parametrised cosmological models 
 that encompass classes of gravity theories\, such as scalar-tensor\, vecto
 r-tensor and bimetric theories.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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