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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Maths HEP Lunchtime Seminars: Black Saturn

Presented by Pau Figueras, Barcelona

9 February 2007 13:00 in CM221

In this talk I will present a new exact stationary
asymptotically flat 4+1-dimensional vacuum solution
describing ``black
saturn'': a spherical black hole surrounded by a black
ring. Angular momentum keeps the configuration in
equilibrium. Black saturn reveals a number of
interesting gravitational phenomena:
(1) The balanced solution exhibits 2-fold continuous
non-uniqueness for fixed mass and angular momentum;
(2) Remarkably, the 4+1d Schwarzschild black hole is
not unique, since the black ring and black hole of
black saturn can counter-rotate to give zero total
angular momentum at infinity, while maintaining
(3) The system cleanly demonstrates rotational
frame-dragging when a black hole with vanishing Komar
angular momentum is rotating as the black ring drags
the surrounding spacetime.
Possible generalizations include multiple rings of
saturn as well as doubly spinning black saturn

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