Back reaction as an alternative to dark energy and modified gravity

by Syksy Rasanen (CERN)

Thursday 22 Jan 2009, 11:00 → 12:00 Europe/Zurich

LAPTH Auditorium, Annecy-le-Vieux (LAPTH Auditorium, Annecy-le-Vieux)

When the backreaction of inhomogeneities on the expansion of the universe is taken into account, it may be possible to explain late-time observations without dark energy or modified gravity. I will explain the physics involved, and will present a semi-realistic model where the observed timescale of about 10 billion years emerges from the physics of structure formation. I will also discuss the relation between the average expansion rate and light propagation.