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Absolute units, or natural units, are a system of units where certain dimensionful constants are set to 1. This often simplifies various formulae.

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Why different versions of the Schwarzschild metric online?

I started studying the Schwarzschild metric and have seen multiple versions of the metric online; specifically different versions of the Schwarzschild radius. In some cases it is $\frac{2GM}{c^2}$, ot …
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