Testing General Relativity with Cosmological observations

Speaker: Ruth DURRER
(
  • University of Geneva
)

Abstract

Abstract:

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, observations have mainly tested the vacuum equations of GR. The most important non-vacuum case, cosmology, is in agreement with GR only after the introduction of two otherwise unknown components, 'Dark Matter' and 'Dark Energy' 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 cosmology. Might it be that GR is flawed on large, cosmological scales? Or in the presence of matter in general? But how can we test Einstein's equation in the presence of matter. Can't we simply move any modification of the Einstein tensor to the right hand side and call it a 'dark matter/energy' component?

In my talk I shall discuss possible ways (partially) out of this dilemma. How to test both, the left and the right hand side of Einstein's equations with cosmological observations.

Video

Related research groups

Mar152019

Testing General Relativity with Cosmological observations

Higgs Centre Colloquium
Higgs Centre Seminar Room, JCMB
The Higgs Centre for Theoretical Physics
School of Physics and Astronomy
James Clerk Maxwell Building
Peter Guthrie Tait Road
Edinburgh
EH9 3FD
UK