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Lemaître coordinates are a particular set of coordinates for the Schwarzschild metric—a spherically symmetric solution to the Einstein field equations in vacuum—introduced by Georges Lemaître in 1932. Changing from Schwarzschild to Lemaître coordinates removes the coordinate singularity at the Schwarzschild radius.
Art, Metric & Geodesics
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displaystyle schwarzschild tau coordinate time lemaître coordinates metric proper radius geodesics one singularity inside rho gullstrand painlevé radial infty point
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