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Accueil > Séminaires & Soutenances > Séminaires, soutenances de thèses et HDR précédents > 2014 > Séminaires 2014 > Le jeudi 6 mars à 14h

Le jeudi 6 mars à 14h

Fabrice Mottez (LUTH, Obs. Paris-Meudon) - What theoreticians say about pulsars

Lieu  : Palaiseau, salle de réunion de l’aile 0 (exLIX)

Abstract  : Many of the basic concepts of pulsar physics were discovered in the years 70’. These discoveries include the role of the neutron star fast rotation and high magnetic fields, the production of electron-positron plasma with photons, and some basics of plasma acceleration. But they where like the separate (and maybe incomplete) pieces of a jigsaw-puzzle. It was difficult to assemble them to give a coherent picture of the neutron stars magnetospheres. In particular, an important but dangerous region called the "light cylinder" raised real difficulties because many equations have a singularity there. In the early 2000’s, the input derived from decades of radio-observations and with the recent X and gamma ray telescopes have raised a new interest in pulsar physics, bringing new discoveries and new questions. In parallel to the observations, an effort have been made in the understanding and the numerical modelling of the pulsar physics. Self-consistent models of pulsars are now available with numerical simulations. Some of these models inform us about the shape of their magnetosphere, the X and gamma ray emission regions, and some others tell us about the production of plasma or the particle acceleration. We still do not have a credible and global view of pulsars magnetospheres, but pieces of the jigsaw-puzzle start to be assembled. I will attempt a review of the state of the art. Slides in English, French spoken.

CNRS Ecole Polytechnique Sorbonne Université Université Paris-Saclay Observatoire de Paris
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Dominique Fontaine (Directrice)