  The role of radiation in general relativistic magnetohydrodynamic (GRMHD)
accretion simulations is discussed through axisymmetric simulations of the
evolution of an initial torus seeded with a weak magnetic field. The paper
compares and contrasts the rate of accretion onto a Kerr black hole and mass
flux out out of the initial torus at large radii in the GRMHD code of De
Villiers and Hawley and a newly developed radiative GRMHD code. This rGRMHD
code currently operates in the diffusion approximation, restricting the study
of radiative effects to the bound portion of the accretion disk/jet system.
However, these preliminary findings suggest that radiative effects do play a
potentially significant role in regulating the accretion flow.
