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What would be the properties of an anti-black hole (concentration of negative mass)? Would it emit radiation? Would time go infinitely fast on its surface?

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    $\begingroup$ I believe the Schwarzschild geometry with a negative mass is perturbatively unstable, though I don't have reference to hand, so a negative matter black hole can't exist. $\endgroup$ – John Rennie Sep 19 '19 at 15:20
  • $\begingroup$ Besides antimatter still has positive mass and the no hair theorem implies no difference between black holes made of matter or antimatter $\endgroup$ – Lewis Miller Sep 19 '19 at 15:36
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    $\begingroup$ @Lewis Miller this question has nothing to do with antimatter $\endgroup$ – Anixx Sep 19 '19 at 15:44
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    $\begingroup$ Perhaps you should just call it a black hole with negative mass to avoid confusion. $\endgroup$ – Lewis Miller Sep 19 '19 at 15:46
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    $\begingroup$ @JohnRennie: I believe the Schwarzschild geometry with a negative mass is perturbatively unstable … Here is a reference: “Instability of the negative mass Schwarzschild naked singularity”, gr-qc/0604021 $\endgroup$ – A.V.S. Sep 19 '19 at 16:29

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