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Leo C. Stein 🦁
duetosymmetry
Want to understand the *index* of a vector field V? Take a little circle around where V vanishes. At some point θ (blue), look at the unit vector V/|V| (orange).
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Ok, since people were asking… Here's an easy way to see that Hawking radiation is not due to particle–anti-particle pair at the horizon. First thing to remember is a that
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