Re: Black Hole Repulsion

Paul White <pgwhite4381@xxxxxxxxxxx> wrote:
Consider two identical Kerr black holes, both spinning at near the
maximum rate and with spins anti-parallel. Also assume both lie in the
plane of their spin axes. I wonder if there will be a force of repulsion
between the two, caused by the effects of mutual frame dragging?

Yes. See
http://www.arxiv.org/abs/gr-qc/0207090
for an approximate calculation (valid if the black holes aren't too
close together), or
http://www.arxiv.org/abs/gr-qc/0604100
for a numerical calculation using full nonlinear general relativity.

ciao,

--
-- "Jonathan Thornburg -- remove -animal to reply" <jthorn@xxxxxxxxxxxxxxxx>
Max-Planck-Institut fuer Gravitationsphysik (Albert-Einstein-Institut),
Golm, Germany, "Old Europe" http://www.aei.mpg.de/~jthorn/home.html
"Washing one's hands of the conflict between the powerful and the
powerless means to side with the powerful, not to be neutral."
-- quote by Freire / poster by Oxfam

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