[1/4] “Frame dragging” by a rotating black hole is a very cool phenomenon — and less arcane than it’s often portrayed to be. Suppose you woke up in some kind of space habitat, with a dome that showed you a sky full of stars that remained perfectly still. You feel 1 gee’s weight.
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I inadvertently used a mix of conventional units (ω, g and c) and geometric units (R and M). In geometric units, G=c=1, and mass and distance have the same units, so R/M is dimensionless. I should have written: ω < g / [c (2R/R_s–1)] R_s = 2GM/c^2
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If the mass at the center of a black hole condenses to an infinitesimal point of infinite density, does conservation of angular momentum imply that the mass would also have infinite rotational speed? Or does the concept of rotation no longer apply to such a point?
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Nobody really knows the fate of the matter that collapses while forming a black hole, but it’s unlikely that anything becomes literally infinitesimal or literally infinite.
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I am surprised that flat earthers haven't seized in this!
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How fast can a black hole spin?
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The greatest angular momentum a black hole can have is (in geometric units where G=c=1): L=M^2 or in conventional units: L = (G/c) M^2
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Čini se da učitavanje traje već neko vrijeme.
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