Chiral Phase Transitions around Black Holes
  In this paper we discuss the possibility that chiral phase transitions, analogous to those of QCD, occur in the vicinity of a black hole. If the black hole is surrounded by a gas of strongly interacting particles, an inhomogeneous condensate will form. We demonstrate this by explicitly constructing self-consistent solutions. 
Antonino Flachi and Takahiro Tanaka
hep-th astro-ph.HE gr-qc hep-ph nucl-th