Coiffured black rings

Iosif Bena (1) , Simon F. Ross (2) , Nicholas P. Warner (3)

1 IPHT - Institut de Physique Théorique - UMR CNRS 3681
2 Centre for Particle Theory
3 Department of Physics and Astronomy [USC, Los Angeles]

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.

Keywords: black hole hair; supersymmetric solutions; black rings

Domains: High Energy Physics - Theory [hep-th]; General Relativity and Quantum Cosmology [gr-qc]

Iosif Bena, Simon F. Ross, Nicholas P. Warner. Coiffured black rings. Classical and Quantum Gravity, 2014, 31, pp.165015. ⟨10.1088/0264-9381/31/16/165015⟩. ⟨cea-01120750⟩