Maths HEP Lunchtime Seminars: Is modified gravity responsible for the accelerating universe?
21 October 2005 00:00 in CM221
"I will begin with a brief introduction to the observational evidence for the accelerating Universe, dark energy and the cosmological constant problem. I will then discuss the possibility that this acceleration is caused by a low-energy modification to Einstein's General theory of Relativity. These modifications are in the form of inverse curvature invariants added to the usual Einstein-Hilbert action and dominate cosmological dynamics at late times. A special inverse curvature invariant constructed from the Riemann tensor is predicted by the classical limit of a particular model of quantum gravity. I will focus on the difficulties of constructing viable low energy deformations of General Relativity, both from a theoretical and observational standpoint. "