TY - JOUR
T1 - Note on bunching of field lines in black hole magnetospheres
AU - Gralla, Samuel E.
AU - Lupsasca, Alexandru
AU - Rodriguez, Maria J.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/8/28
Y1 - 2015/8/28
N2 - Numerical simulations of Blandford-Znajek energy extraction at high spin have revealed that field lines tend to bunch near the poles of the event horizon. We show that this behavior can be derived analytically from the assumption of fixed functional dependence of current and field line rotation on magnetic flux. The argument relies crucially on the existence of the Znajek condition, which offers nontrivial information about the fields on the horizon without requiring a full force-free solution. We also provide some new analytic expressions for the parabolic field configuration.
AB - Numerical simulations of Blandford-Znajek energy extraction at high spin have revealed that field lines tend to bunch near the poles of the event horizon. We show that this behavior can be derived analytically from the assumption of fixed functional dependence of current and field line rotation on magnetic flux. The argument relies crucially on the existence of the Znajek condition, which offers nontrivial information about the fields on the horizon without requiring a full force-free solution. We also provide some new analytic expressions for the parabolic field configuration.
UR - http://www.scopus.com/inward/record.url?scp=84940842736&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84940842736&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.92.044053
DO - 10.1103/PhysRevD.92.044053
M3 - Article
AN - SCOPUS:84940842736
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 4
M1 - 044053
ER -