Speaker
Marta Orselli
(Perugia Univ.)
Description
In Nature there are several astrophysical systems surrounded by
a magnetosphere with a plasma that can be described using the so-called
force-free electrodynamics (FFE). This is the case for example of black
hole magnetospheres. By analyzing the stationary axisymmetric magnetosphere
surrounding a spinning black hole, Blandford and Znajek realized that one
could extract energy from a rotating black hole: the Blandford and Znajek
mechanism. By studying in detail the Blandford and Znajek monopole solution
we find however that it’s validity breaks down before reaching the
asymptotic region. Motivated by this result, we investigate a new approach
to find a solution of FFE equations which is valid everywhere.
