Accretion of rotating fluids onto stationary solutions
  We consider a general stationary solution and derive the general laws for
accretion of rotating perfect fluids. For non-degenerate and degenerate Fermi
and Bose fluids we derive new effects that mimic the center-of-mass-energy
effect of two colliding particle in the vicinity of horizons. Non-degenerate
fluids see their chemical potential grow arbitrarily and ultra-relativistic
Fermi fluids see their specific enthalpy and Fermi momentum grow arbitrarily
too while the latter vanishes gradually for non-relativistic Fermi fluids. For
degenerate Bose fluids two scenarios remain possible as the fluid approaches a
horizon: a) The Bose-Einstein condensation ceases or b) the temperature drops
gradually down to zero.
