  The standard thin accretion disk model has been successfully used to explain
the soft X-ray spectra of Galactic black hole systems and perhaps the UV
emission of Active Galactic Nuclei. However, radiation pressure dominated disks
are known to be viscously unstable and should produce large amplitude
oscillations that are typically not observed. Instead, these sources exhibit
stochastic variability which may naturally arise due to viscous fluctuations in
a turbulent disk. Here we investigate whether these aperiodic viscous
fluctuations can stabilize the inner radiation pressure dominated disks and
hence maybe the answer to a forty year old problem in accretion disk theory.
