SÉMINAIRE DU GRECO
"Spacetime approach to forcefree magnetospheres" 

Ted Jacobson 

Neutron star and black hole magnetospheres are often modeled using forcefree electrodynamics. In this peculiar scheme, the vanishing of the 4force on the current plays the role of a field equation, with the current defined by the field via Maxwell's equations. The theory is usually presented in 3+1 form in terms of electric and magnetic fields, but both its intrinsic structure and the systems to which it is applied are fully (general) relativistic. In this talk I will review the structure of this theory and show how it becomes remarkably simple and elegant when treated relativistically with the help of exterior differential forms. Topics covered may include the wellknown Michel rotating monopole and split monopole, current sheets, the BlandfordZnajek solution, new solutions without stationarity or axisymmetry, and the general structure of spinning neutron star and black hole magnetospheres.


lundi 14 octobre 2013  14:00 Salle des séminaires François Arago, Institut d'Astrophysique de Paris 
