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School of Physics and Astronomy

How to model lensing due to the small-scale structure of the Universe?

14 October 2015

Time: 3:00pm
Venue: G. O. Jones Room 510

The London Relativity and Cosmology Seminar
Pierre Fleury (Paris)

Cosmological observations are usually interpreted as if light propagated through a smooth, fluid-filled Universe. However, when point-like sources—such as supernovae—are at stake, the associated light beams are so narrow that the clumpy small-scale structure of our Universe may become more relevant that its large-scale structure. In this talk, I will present two approaches for modelling and quantifying the effect of small scales on light propagation: Swiss-cheese models on the one hand, and stochastic techniques on the other hand.