A non-homogeneous ground state of the low-temperature Sakai-Sugimoto   model
  We study the instability of the low-temperature QCD vacuum at large-N_c due to an axial chemical potential, using the holographic Sakai-Sugimoto model. We explicitly construct the ground state of the theory, which corresponds to a translationally non-invariant configuration. 
C.A. Ballon Bayona, Kasper Peeters and Marija Zamaklar
hep-th hep-ph