Inclusion of the effect of radiation pressure on the accretion phenomena
  in astrophysics
  In the present work, we would like to elaborate on Shakura Sunyaev Alpha disk
model. To be more concrete, inclusion of the effect of the radiation pressure
on the accretion phenomena have been carefully studied. To summarize, the
present modification of Shakura Sunyaev Alpha disk model of disk accretion can
be regarded as a new candidate theory of ADAF. Reduction of accreting matter's
angular velocity leads to the suppression of the disk luminosity and the
surface temperature which essentially implies the transition of the standard
accretion disk model from CDAF to ADAF.
