General steady viscous flux in a Keplerian disk
= General steady viscous flux in a Keplerian disk
{title2=$\bar\nu\Sigma=A+B r^{-1/2},\quad\dot M=3\pi A$}
Two integrations of the steady <Keplerian viscous diffusion equation> give this general transported quantity. $A$ fixes the <mass accretion rate>, while $B$ fixes the additive <angular-momentum flux> or inner <torque>. A <zero-torque inner boundary condition> gives $B=-A\sqrt{r_{\rm in}}$; a <nonaccreting constant-torque disk> has $A=0$.