Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-06-12
JHEP 0811:011,2008
Physics
High Energy Physics
High Energy Physics - Theory
38 pages, 6 figures. v2: changes in terminology, refs added. v3: minor improvements, refs added, published version
Scientific paper
10.1088/1126-6708/2008/11/011
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.
Caldarelli Marco M.
Emparan Roberto
Rodriguez Maria J.
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