# Schwarzschild metric

The Schwarzschild solution can be expressed in a range of different choices of coordinates besides the Schwarzschild coordinates used above. Different choices tend to highlight different features of the solution. The table below shows some popular choices.

This surface has the property that distances measured within it match distances in the Schwarzschild metric, because with the definition of *w* above,

The group of isometries of the Schwarzschild metric is the subgroup of the ten-dimensional PoincarĂ© group which takes the time axis (trajectory of the star) to itself. It omits the spatial translations (three dimensions) and boosts (three dimensions). It retains the time translations (one dimension) and rotations (three dimensions). Thus it has four dimensions. Like the PoincarĂ© group, it has four connected components: the component of the identity; the time reversed component; the spatial inversion component; and the component which is both time reversed and spatially inverted.

Components which are obtainable by the symmetries of the Riemann tensor are not displayed.