Speaker
Felix Berkhahn
Description
Explaining the acceleration of the universe in a technical
natural manner is an outstanding theoretical challenge.
Given that the acceleration is triggered by sources of
cosmological wavelength, a tempting approach to the
problem is to modify the theory of general gravity at
those distances. In this talk I will present two different
such infrared modifications: Certain theories of massive
gravitons on curved backgrounds, and the theory of
brane induced gravity in higher codimensions. I will
discuss both the consistency and the phenomenological
implications of these theories.
