Ruth Durrer
Department of Theoretical Physics, University of Geneva, Geneva
Ruth Durrer (right) with Gian Michele Graf
Date
21 October 2015
Host
Gian Michele Graf
Title
Massive Gravity and Bigravity as a Solution of the Dark Energy Problem
Abstract
Cosmological data have shown that the expansion of the Universe is presently accelerated. This data can be fitted with a cosmological constant. But the value is very fine tuned and not protected from quantum corrections. This accentuates the old cosmological constant problem. In my talk I discuss an alternative: The graviton might be massive. This weakens gravity on large scales (‘degravitation’) and can even lead to accelerated expansion.