Look Who it Was Random video

Taking the fingerprints of the universe | Julien Lesgourgues | TEDxCERN

3,935 views · Published 28 October 2014 · 15:50 · Indexed 7 October 2026

Channel: TEDx Talks · 2014 · Nonprofits & Activism

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This talk was given at a local TEDx event, produced independently of the TED Conferences. For centuries, humans have had to make assumptions about the composition of the universe. But recently, cosmologists have made observations and discoveries that allow us to understand the real history of the universe over the past 12 billion years! Julien Lesgourges explains how and why it is a privilege to be part of this generation.

Julien Lesgourgues, cosmologist, explores questions like where did the universe come from, what triggered its evolution, does it contain hints of physical laws or species that we are not yet aware of? A member of the Planck satellite team which published the map of the cosmic microwave background in 2013, he specialises in modelling the evolution of cosmological perturbations, starting from a stage in the early universe called inflation. He authored CLASS, a code used by cosmologists to simulate the universe and watch it evolve on a computer. He is passionate about the arts and also sings operas.

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