When people speak of the electric charge of a black hole, do we actually mean it affects things outside of the event-horizon or is it just a property it has?
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3$\begingroup$ Related: Why can an electric field escape from a black hole? and Why does the electric field escape a black hole? and How can a black hole have a charge? and probably others. $\endgroup$– G. SmithCommented Aug 17, 2020 at 20:15
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4$\begingroup$ Does this answer your question? Why can an electric field escape from a black hole? $\endgroup$– J. MurrayCommented Aug 17, 2020 at 20:22
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1$\begingroup$ More: Detection of the electric charge of a black hole $\endgroup$– G. SmithCommented Aug 17, 2020 at 20:23
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$\begingroup$ Also related: math.ucr.edu/home/baez/physics/Relativity/BlackHoles/… $\endgroup$– PM 2RingCommented Aug 17, 2020 at 20:36
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$\begingroup$ Thank you so much, tried searching for these questions but my limited physics-knowledge failed me. $\endgroup$– taracusCommented Aug 18, 2020 at 5:00
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I'll answer the question in the body of your post and not in the original subject line (on force carriers) which is a different subject. . from our reference frame safely outside the black hole, all the objects that fall into it never make it through the event horizon: they appear to get stuck there in a vanishingly thin layer just outside the EH. This includes electrical charges, which to us appear to reside just outside the EH and radiate their field lines outward into space just as if the black hole itself (inside the EH) were a point charge in space. So any net electric field that a black hole may possess is simply the sum of all the charge that fell onto its event horizon over its lifetime, plus whatever charge it originally had before it collapsed into a black hole.
Those charges radiate their field into space and would be detectable to us in the same way any other charged object would be.
answered Aug 17, 2020 at 20:53
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$\begingroup$ This doesn’t explain “eternal” black hole solutions with charge. $\endgroup$– G. SmithCommented Aug 18, 2020 at 3:57
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$\begingroup$ you can do so in another answer. If it's better than mine I'll delete mine. $\endgroup$ Commented Aug 18, 2020 at 4:35
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$\begingroup$ @G.Smith The charge of (non-existing) eternal black holes is also located at the horizon, as observed from outside. The (hypothetical) inner spacetime is in the causal future and has no effect on the outside. $\endgroup$ Commented Aug 18, 2020 at 15:08
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