Black Saturn

Details Black Saturn Black Saturn

2007-01-04

arxiv.org/abs/hep-th/0701035v2

JHEP 0705:050,2007

Physics

High Energy Physics

High Energy Physics - Theory

48 pages, 35 figures. v2: clarifications + new discussion of two sectors of balanced solutions + corrections.

Scientific paper

10.1088/1126-6708/2007/05/050

Using the inverse scattering method we construct an 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 balance; (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 configurations.

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