8-12 juin, 2014

Résumé

TESTING GRAVITY THROUGH COSMOLOGICAL SURVEYS

Ali Narimani (University of British Columbia)

Douglas Scott
University of British Columbia

General relativity (GR) has proven to be an extremely successful theory for explaining a wide range of observations, from the solar system up to galaxy scales, and from low energy phenomena to pulsars and black holes. However, both theoretical demands for a more complete theory, and observational puzzles, such as dark energy and dark matter, have motivated researchers to construct models that modify the physics of GR. This talk will discuss generic parameterizations of modified gravity models that help to characterize the effects of such modifications on cosmological solutions. Empirical constraints from the cosmic microwave background anisotropies, baryon acoustic oscillations, gravitational lensing and other cosmological probes can be used to test modifications to GR on the largest accessible scales. Specific examples will be used to highlight more general features of these constraints, which physically come from geometry, perturbation growth, scale-dependence, time-dependent equations of state, etc. With a careful scheme to categorize different kinds of deviation from GR, we should be able to interpret constraints coming from future experimental results.
(doit être confirmé par le SOC)