9,262 research outputs found
Bicycling Black Rings
We present detailed physics analyses of two different 4+1-dimensional
asymptotically flat vacuum black hole solutions with spin in two independent
planes: the doubly spinning black ring and the bicycling black ring system
("bi-rings"). The latter is a new solution describing two concentric orthogonal
rotating black rings which we construct using the inverse scattering technique.
We focus particularly on extremal zero-temperature limits of the solutions. We
construct the phase diagram of currently known zero-temperature vacuum black
hole solutions with a single event horizon, and discuss the non-uniqueness
introduced by more exotic black hole configurations such as bi-rings and
multi-ring saturns.Comment: 32 pages, 12 figure
Black Rings in (Anti)-deSitter space
We construct solutions for thin black rings in Anti-deSitter and deSitter
spacetimes using approximate methods. Black rings in AdS exist with arbitrarily
large radius and satisfy a bound |J| \leq LM, which they saturate as their
radius becomes infinitely large. For angular momentum near the maximum, they
have larger area than rotating AdS black holes. Thin black rings also exist in
deSitter space, with rotation velocities varying between zero and a maximum,
and with a radius that is always strictly below the Hubble radius. Our general
analysis allows us to include black Saturns as well, which we discuss briefly.
We present a simple physical argument why supersymmetric AdS black rings must
not be expected: they do not possess the necessary pressure to balance the AdS
potential. We discuss the possible existence or absence of `large AdS black
rings' and their implications for a dual hydrodynamic description. An analysis
of the physical properties of rotating AdS black holes is also included.Comment: 38 pages, 6 figures. v2: changes in terminology, refs added. v3:
minor improvements, refs added, published versio
Black Hole Monodromy and Conformal Field Theory
The analytic structure of solutions to the Klein-Gordon equation in a black
hole background, as represented by monodromy data, is intimately related to
black hole thermodynamics. It encodes the "hidden conformal symmetry" of a
non-extremal black hole, and it explains why features of the inner event
horizon appear in scattering data such as greybody factors. This indicates that
hidden conformal symmetry is generic within a universality class of black
holes.Comment: 20 pages, v2 minor corrections, updated reference
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