Comment on Viscous Stability of Relativistic Keplerian Accretion Disks
  Recently Ghosh (1998) reported a new regime of instability in Keplerian accretion disks which is caused by relativistic effects. This instability appears in the gas pressure dominated region when all relativistic corrections to the disk structure equations are taken into account. We show that he uses the stability criterion in completely wrong way leading to inappropriate conclusions. We perform a standard stability analysis to show that no unstable region can be found when the relativistic disk is gas pressure dominated. 
R. Moderski and B. Czerny (Nicolaus Copernicus Astronomical Center)