HET Journal club: Gianluca Grignani

Speaker: Gianluca Grignani

Title: Force free electrodynamics in a Kerr black hole background

Abstract: The static monopole is a solution of the force free electrodynamics (FFE) equations in a Schwarzschild metric background. To obtain a solution in a Kerr background, a perturbation theory for small black hole angular momentum was first considered  and this led to the celebrated Blandford and Znajek solution as the first perturbative correction to the static monopole. We show that the perturbation theory around the static monopole is actually inconsistent and we propose to perturb around the rotating monopole solution, this might lead to a new, everywhere well defined, solution of the FFE equations in a Kerr black hole.