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SUMMARY:Cosmological tests of gravity  - Kazuya Koyama (ICG Portsmouth)
DTSTART:20150302T130000Z
DTEND:20150302T140000Z
UID:TALK57368@talks.cam.ac.uk
CONTACT:Tommaso Giannantonio
DESCRIPTION:The discovery of the accelerated expansion of the Universe has
  come relatively late in our study of the cosmos\, but in showing that gra
 vity can act repulsively\, it has opened up many new questions about the n
 ature of gravity and what the Universe might contain. Is the acceleration 
 being driven by dark energy?  Or is general relativity (GR) itself in erro
 r\, requiring a modification at large scales to account for the late accel
 eration? Structure formation in our Universe can be different even if the 
 geometry of the homogeneous and isotropic universe is the same in these tw
 o classes of models\, offering a possibility to distinguish between them o
 bservationally. Non-linear structure formation is complicated by the fifth
  force that commonly appears in modified gravity models and new techniques
  are required to analyse it. We will discuss novel methods to test GR on c
 osmological scales\, building on the recent developments of N-body simulat
 ions for modified gravity. 
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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