Open AccessBlack saturn
Author(s) -
Henriette Elvang,
Pau Figueras
Publication year - 2007
Publication title -
journal of high energy physics
Language(s) - English
Resource type - Journals
eISSN - 1126-6708
pISSN - 1029-8479
DOI - 10.1088/1126-6708/2007/05/050
Subject(s) - physics , angular momentum , black hole (networking) , rotating black hole , ring singularity , extremal black hole , schwarzschild radius , schwarzschild metric , saturn , charged black hole , classical mechanics , total angular momentum quantum number , astrophysics , general relativity , gravitation , astronomy , horizon , de sitter–schwarzschild metric , planet , computer network , routing protocol , routing (electronic design automation) , link state routing protocol , computer science
Using the inverse scattering method we construct an exact stationaryasymptotically flat 4+1-dimensional vacuum solution describing Black Saturn: aspherical black hole surrounded by a black ring. Angular momentum keeps theconfiguration in equilibrium. Black saturn reveals a number of interestinggravitational phenomena: (1) The balanced solution exhibits 2-fold continuousnon-uniqueness for fixed mass and angular momentum; (2) Remarkably, the 4+1dSchwarzschild black hole is not unique, since the black ring and black hole ofblack saturn can counter-rotate to give zero total angular momentum atinfinity, while maintaining balance; (3) The system cleanly demonstratesrotational frame-dragging when a black hole with vanishing Komar angularmomentum is rotating as the black ring drags the surrounding spacetime.Possible generalizations include multiple rings of saturn as well as doublyspinning black saturn configurations.Comment: 48 pages, 35 figures. v2: clarifications + new discussion of two sectors of balanced solutions + corrections
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