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The moment of inertia of a massive object about a given axis describes how its mass is distributed about that axis. I understand that a rotating black hole of a given mass and angular velocity possesses angular momentum, and one would think that it therefore possesses a certain moment of inertia about its axis of rotation. My question is this: can knowledge of that moment of inertia tell us anything about how the black hole's mass is distributed about its axis of rotation?


marked as duplicate by John Rennie black-holes Oct 19 '17 at 14:26

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    $\begingroup$ physics.stackexchange.com/q/310881 $\endgroup$ – user121330 Oct 18 '17 at 23:24
  • $\begingroup$ thanks for the reference, I did find it earlier this week, but it did not reveal to me whether the value for the moment of inertia could be understood in terms of a spatial distribution of mass. Also, the results were expressed in units in which c and G were set to 1, which makes those results difficult for me to interpret. $\endgroup$ – niels nielsen Oct 19 '17 at 4:18

1; Are you asking regarding a specific "point" or location on the event horizon, inside the event horizon, or in a general angular region relative to the axis of rotation? To me, it seems you are wrestling with defining the "membrane" of the event horizon, which I believe would be impossible, as that is the region of ultimate flux as can be located by mankind, currently. 2;Were "1" defined, I think the logical answer is yes, but "1" seems to be in constant flux, and undefinable to a quantifiable point. Possibly by general latitudes/longitudes, but even then the flux as mass converts and or is accrued would be changing too voluminously to render anything more than speculative generalizations. In my opinions....

  • $\begingroup$ Sorry, I meant outside the event horizon. I do not understand your other comments. $\endgroup$ – niels nielsen Oct 19 '17 at 4:21

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