Séminaire / Seminar GReCO |
| « Magnetic fields in the Universe: the primordial option » |
|
E. Fenu |
| I will briefly review the current status of magnetic field observations in the last few years. These experimental observations can be explained assuming that the primordial Universe was permeated by a seed magnetic field. Several mechanisms have been proposed to generate such a primordial field. I will explain how to obtain extremely strong upper bounds on the amplitude of seed magnetic fields by studying their production of gravitational waves. Finally, I will briefly investigate a possible way out to these strong upper bounds: the production of magnetic fields during the recombination epoch, when the tight coupling approximation between photons and baryons breaks down. Is this mechanism able to generate a primordial magnetic field with an amplitude big enough to be a reasonable seed? |
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lundi 17 janvier 2011 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |