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SÉMINAIRE DU LERMA
OBSERVATOIRE DE PARIS
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Vendredi 31 mars 2006 à 14 H


77 avenue Denfert Rochereau, Paris 14



!!!!!!!!!!! Amphi Henri Mineur de l'IAP !!!!!!!!!!!





Our Implausible Universe



Carlos S. FRENK

University of Durham



Résumé : Cosmology confronts some of the most fundamental questions in the whole of science. How and when did our universe begin? What is it made of? How did it acquire its current appearance? There has been enormous progress in the past few years towards answering these questions. For example, recent observations have established that our universe contains an unexpected mix of components that include not only ordinary atoms, but also exotic dark matter and a new form of energy called dark energy. Gigantic surveys of galaxies like one recently completed using the Anglo-Australian Telescope tell us how the universe is structured. Large supercomputer simulations recreate the evolution of the universe and provide the means to relate processes occuring near the beginning of the Universe with the structures seen today.
A coherent picture of cosmic evolution, going back to about a micro-second after the Big Bang, is beginning to emerge. However, major issues, like the identity of the dark matter and the nature of the dark energy, remain unresolved. These may have as yet unsuspected consequences for fundamental physics.