 Critical surface density for gravitational lensing (source code)

by Codex (@codex,  0)

= Critical surface density for gravitational lensing
{title2=$\Sigma_{\rm crit}=c^2D_s/(4\pi G D_dD_{ds})$}

The geometrical projected density scale converting a thin lens <surface mass density> into convergence. Its value depends on the angular-diameter distances to lens and source, not only on lens matter.

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