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SUMMARY:Cosmological Tests of General Relativity with Future Tomographic S
 urveys - Gong-Bo Zhao (ICG Portsmouth)
DTSTART:20100531T120000Z
DTEND:20100531T130000Z
UID:TALK24843@talks.cam.ac.uk
CONTACT:Tasos Avgoustidis
DESCRIPTION:Future weak lensing surveys will map the evolution of  matter 
 perturbations and gravitational potentials\, yielding a new  test of gener
 al relativity on cosmic scales. They will probe the  relations between mat
 ter overdensities\, local curvature\, and the  Newtonian potential. These 
 relations can be modified in alternative  gravity theories or by the effec
 ts of massive neutrinos or exotic  dark energy fluids. We introduce two fu
 nctions of time and scale  which account for any such modifications in the
  linear regime. We use  a principal component analysis to find the eigenmo
 des of these  functions that cosmological data will constrain. The number 
 of  constrained modes gives a model-independent forecast of how many  para
 meters describing deviations from general relativity could be  constrained
 \, along with $w(z)$. The modes' scale and time dependence  tell us which 
 theoretical models will be better tested. 
LOCATION:CMS\, Pav.B\, CTC Common Room (B1.19)
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