Vortexes in Black Holes
  We argue that black holes admit vortex structure. This is based both on a
graviton-condensate description of a black hole as well as on a correspondence
between black holes and generic objects with maximal entropy compatible with
unitarity, so-called saturons. We show that due to vorticity, a $Q$-ball-type
saturon of a calculable renormalisable theory obeys the same extremality bound
on the spin as the black hole. Correspondingly, a black hole with extremal spin
emerges as a graviton condensate with vorticity. Next, we show that in the
presence of mobile charges, the global vortex traps a magnetic flux of the
gauge field. This can have macroscopically-observable consequences. For
instance, the most powerful jets observed in active galactic nuclei can
potentially be accounted for. As a signature, such emissions can occur even
without a magnetized accretion disk surrounding the black hole. The flux
entrapment can provide an observational window to various hidden sectors, such
as millicharged dark matter.
