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School of Physics and Astronomy


28 November 2012

Time: 4:30pm
Venue: Maths 103

Series: The London Relativity and Cosmology Seminar
Speaker: Phil Bull (Oxford)
Abstract: A wide range of cosmological observations imply that the expansion of the Universe is accelerating -- if they are interpreted within a homogeneous and isotropic FLRW model. On considering inhomogeneous models, however, we find that "acceleration" becomes a rather ambiguous concept. In this talk, I describe how the question of whether spacetime is accelerating depends on what measure of acceleration is being used, and explain how this affects attempts to solve the dark energy problem.