Date:
12. December 2014 - 11:30 to 12:30
Speaker:
Pierre Fleury (IAP, Paris)
Abstract: In the standard cosmological framework, observations are interpreted as if light propagated through a smooth, fluid-filled universe. However, the typical light beams involved in astronomical observations — such as supernovae — are extremely narrow, and thus probe the Universe at scales where the fluid description should no longer be valid. In this talk, I will explain how the clumpiness of the distribution of matter can affect light propagation through the cosmos, and thus the interpretation of our observations.