= Gravitational stress contribution to angular-momentum transport
{title2=$rT_{r\phi}$}
In cylindrical coordinates, the <Newtonian gravitational stress tensor> gives radial <angular-momentum flux> $rT_{r\phi}=r(\partial_r\Phi)(r^{-1}\partial_\phi\Phi)/(4\pi G)$. Nonaxisymmetric structure can correlate the field components and transport <angular momentum>. The isotropic negative-pressure part has zero off-diagonal component, so it gives no direct radial transport. This separates a shear flux from a contribution to normal force balance.
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