**Schwarzschild Coordinates**

In the theory of Lorentzian manifolds, spherically symmetric spacetimes admit a family of *nested round spheres*. In such a spacetime, a particularly important kind of coordinate chart is the **Schwarzschild chart**, a kind of polar spherical coordinate chart on a static and spherically symmetric spacetime, which is *adapted* to these nested round spheres. The defining characteristic of Schwarzschild chart is that the radial coordinate possesses a natural geometric interpretation in terms of the surface area and Gaussian curvature of each sphere. However, radial distances and angles are not accurately represented.

These charts have many applications in metric theories of gravitation such as general relativity. They are most often used in static spherically symmetric spacetimes. In the case of general relativity, Birkhoff's theorem states that every *isolated* spherically symmetric vacuum or electrovacuum solution of the Einstein field equation is static, but this is certainly not true for perfect fluids. We should also note that the extension of the exterior region of the Schwarzschild vacuum solution inside the event horizon of a spherically symmetric black hole is not static inside the horizon, and the family of (spacelike) nested spheres cannot be extended inside the horizon, so the Schwarzschild chart for this solution necessarily breaks down at the horizon.

Read more about Schwarzschild Coordinates: Definition, Killing Vector Fields, A Family of Static Nested Spheres, Coordinate Singularities, Visualizing The Static Hyperslices, A Metric Ansatz, Some Exact Solutions Admitting Schwarzschild Charts, Generalizations

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