This question is motivated by one on stack exchange, and on this paper (which comes across a bit student-y but it claims to have been reviewed, and in any case I have reproduced its results in ctensor and gnuplot).(adsbygoogle = window.adsbygoogle || []).push({});

So: the KS (abbreviation!) conveys an overview of curvature at a given point in spacetime, which is nice, but whereas the KS for Schwarzschild has the same sign everywhere, that for the Kerr solution changes sign for various values of spin parameter (see diagrams in PDF). Does this change of sign relate to anything physical?

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# Sign of Kretschmann Scalar in Kerr Metric

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