Gravitational Phase Transition of Fermionic Matter in a   General-Relativistic Framework
  The Thomas-Fermi model at finite temperature is extended to describe a system of self-gravitating weakly interacting massive fermions in a general-relativistic framework. By cooling a nondegenerate gas of weakly interacting massive fermions below some critical temperature, a condensed phase emerges, consisting of quasidegenerate fermion stars. For fermion masses of 10 to 25 keV, these fermion stars may very well provide an alternative explanation for the supermassive compact dark objects that are observed at galactic centers. 
Neven Bilic (Rudjer Boskovic Institute, Zagreb,Croatia) and Raoul D.   Viollier (University of Cape Town, Rondebosch, South ...