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## Main Question or Discussion Point

What is the gravitational binding energy in GR in the spherically symmetric case?

I calculate ##E=mc^2(1-\frac{1}{\sqrt{1-\frac{r_s}{R}}})##

where ##m## is the mass of the body, ##r_s## is the Schwarzschild radius, and ##R## is the area radius as in the Birkhoff theorem.

I calculate ##E=mc^2(1-\frac{1}{\sqrt{1-\frac{r_s}{R}}})##

where ##m## is the mass of the body, ##r_s## is the Schwarzschild radius, and ##R## is the area radius as in the Birkhoff theorem.