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Coiffured black rings

Bena, Iosif; Ross, Simon F.; Warner, Nicholas P.

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Iosif Bena

Nicholas P. Warner


We describe a new type of hair on supersymmetric black string and black ring solutions, which produces the largest known violation of black hole uniqueness, parameterized by an arbitrary function and hence an infinite number of continuous parameters. The new solutions can have non-trivial density profiles for the electric fields along the horizon, and yet have a geometry that is regular, although generically not infinitely differentiable, at the horizon. Both neutral and charged probes can cross the horizon without experiencing divergent forces. We also find restricted examples, parameterized by a few arbitrary continuous parameters, where the charge densities fluctuate but the metric does not and hence is completely differentiable. Our new class of solutions owes its existence to a mechanism reminiscent of the Q-ball: in the simplest examples the metric has more symmetry than the matter that supports it.


Bena, I., Ross, S. F., & Warner, N. P. (2014). Coiffured black rings. Classical and Quantum Gravity, 31(16),

Journal Article Type Article
Publication Date Aug 21, 2014
Deposit Date Aug 6, 2014
Publicly Available Date Aug 6, 2014
Journal Classical and Quantum Gravity
Print ISSN 0264-9381
Electronic ISSN 1361-6382
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 31
Issue 16


Accepted Journal Article (291 Kb)

Copyright Statement
© 2014 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Classical and quantum gravity. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at

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