Wikipedia (as usual) may have the answer for you
'One type of non-traversable wormhole metric is the schwarzschild solution:
ds^2= - (1 - \frac{2GM}{rc^2})dt^2 + \frac{dr^2}{1 - \frac{2GM}{rc^2}} + r^2(d \theta^2 + sin^2 \theta d\phi^2) '
( ,
Wed 3 May 2006, 20:15,
archived)
ds^2= - (1 - \frac{2GM}{rc^2})dt^2 + \frac{dr^2}{1 - \frac{2GM}{rc^2}} + r^2(d \theta^2 + sin^2 \theta d\phi^2) '