Thermal Equilibria of Accretion Disks
  We show that most of hot, optically thin accretion disk models which ignore advective cooling are not self-consistent. We have found new types of optically thin disk solutions where cooling is dominated by radial advection of heat. These new solutions are thermally and viscously stable. 
Marek A. Abramowicz, Xingming Chen, Shoji Kato, Jean-Pierre Lasota,   and Oded Regev