14 October 2015
Venue: G. O. Jones Room 510
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.