Re: wormholes

Anders Sandberg (
07 Dec 1997 18:00:00 +0100

Keith Elis <> writes:

> But how can we tell if a mathematical point is rotating or not?

As Lee Daniel Crocker pointed out, black holes are not points. They
are a pattern of spacetime, and rotates in all physically reasonable
models. A simple way of testing if a black hole rotates (and how fast)
is to drop a small object from towards it. If the object begins to
deviate from a straight fall, then the hole rotates and the deviation
and direction of deviation can be used to calculate the angular

I think there are some popular explanations of this in Pickover's
_Black Holes: A Travellers Guide_. There is also (of course) a more
detailled treatment in Misner, Thorne, Wheeler's _Gravity_.

Anders Sandberg                                      Towards Ascension!                  
GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y