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How do you define a 3D grid in a curved spacetime?
i think what they did was define the 3D grid before the black hole was there in flat space and then placed the black hole at the center origin
I'm gonna guess they're using the coordinates called x, y and z here: https://en.m.wikipedia.org/wiki/Boyer–Lindquist_coordinates …
Yea that’s probably the coordinate system, which is curvilinear. I didn’t know that’s why you were asking
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