BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Testing General Relativity with Cosmological Observations - Ruth D
 urrer\, Geneva
DTSTART:20190116T141500Z
DTEND:20190116T151500Z
UID:TALK117013@talks.cam.ac.uk
CONTACT:Francesca Chadha-Day
DESCRIPTION:General Relativity (GR) is immensely successful. With the late
  discovery of gravitational waves from black hole and neutron star mergers
 \, it has passed all the  tests with flying colors. But so far\, all obser
 vations have mainly tested the vacuum equations of GR. The most important 
 non-vacuum case\, cosmology\, is in agreement with GR only after the intro
 duction of two otherwise unknown components\, 'Dark Matter' and 'Dark Ener
 gy'  which amount to about 96\\% of the total energy budget of the present
  Universe. This let people in the field question the validity of GR for co
 smology. Might it be that GR is flawed on large\, cosmological scales? Or 
 in the presence of matter in general?\nBut how can we test Einstein's equa
 tion in the presence of matter. Can't we simply move any modification of t
 he Einstein tensor to the right hand side and call it a 'dark matter/energ
 y' component?\nIn my talk I shall discuss possible ways (partially) out of
  this dilemma. How to test both\, the left and the right hand side of Eins
 tein's equations with cosmological observations.
LOCATION:MR2\, Centre for Mathematical Sciences
END:VEVENT
END:VCALENDAR