Would a black hole from a star made of anti-matter be the same as a blackhole made of ordinary matter?.

  • $\begingroup$ Pretty much, yes. They would be the same. But what would happen if a regular matter black hole and an anti-matter black hole were to collide? :-) $\endgroup$ – userLTK Aug 31 '16 at 11:44
  • $\begingroup$ that was going to my next question :), would they annihilate each other or merge? $\endgroup$ – Fanana Aug 31 '16 at 11:46
  • $\begingroup$ Would they? (I'm not trying to be difficult, just encouraging you to try to work it out before asking). $\endgroup$ – userLTK Aug 31 '16 at 11:59
  • $\begingroup$ @userLTK How can he possibly work it out? No one could know the answer to that question. $\endgroup$ – zephyr Aug 31 '16 at 12:56
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    $\begingroup$ @userLTK I assume by 2nd question, you're talking about what if you collide an anti-matter and matter black hole, to which I say, my comment is relevant. I'm basically trying to say that there's no such thing as an anti-matter black hole (or matter black hole for that matter). There's just black holes. $\endgroup$ – zephyr Aug 31 '16 at 14:46

To put a formal answer to this question, a black hole made of anti-matter would be indistinguishable from a matter black hole. Black holes are dubious objects, but it seems likely that it makes no sense to talk about an "anti-matter black hole" as once the matter goes into the black hole, be it matter or anti-matter, it ceases to have properties that define it as matter or anti-matter. The No-Hair Theorem for black holes states that, among a few other properties, a black hole is defined only by it's mass and net charge. The matter state of individual particles which fell into the black hole play no part in that description.

In fact, there is a vigorous debate as to whether or not "information" is conserved for black holes. E.g., if an anti-matter particle fell into a black hole, could you, at a later time, pull out a particle of the same properties or would you get out something of completely randomly new properties, not tied to the original matter. This in part plays into your question because it indicates that there is still a lot of uncertainty regarding the loss of information (including if the particle is anti-matter or matter) as particles fall into a black hole and whether not feeding anti-matter into a black hole actually makes it an anti-matter black hole or just simply a black hole.

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    $\begingroup$ So really, it doesn't even matter what the black hole is made of. $\endgroup$ – Sir Cumference Aug 31 '16 at 18:48

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