I've recently read an article that stated the singularity of a black hole could be a string, which is stipulated to be pure energy.

If that's the case, does this mean that the singularity of a black hole could be just pure energy held by gravity? And if that's true, is there a limit to how much energy can occupy the region enclosed by the event horizon?


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  • $\begingroup$ A black hole has a very well-defined mass proportional to its radius. Mass is energy. Ergo, it has a well-defined energy content for a given radius. $\endgroup$ – Nanashi No Gombe Feb 15 at 12:53
  • $\begingroup$ What do you mean? The Schwarzschild radius of a non-rotating black hole is proportional to the energy content of the black hole (a rotating BH is a little more complicated). $\endgroup$ – PM 2Ring Feb 15 at 13:00
  • $\begingroup$ What I meant is that the energy takes another form as opposed to quarks, which is string(s). A better formulated version of this question would be - does energy in form of strings occupy less space than energy in form of matter composed of quarks and above. $\endgroup$ – Bogdan Bulai Feb 15 at 13:09
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    $\begingroup$ A black hole singularity cannot contain normal matter. We need a quantum gravity theory to say what really happens in the core of a black hole. In the mean time, I recommend you take a look at Ben Crowell's answer about black hole singularities in standard general relativity. $\endgroup$ – PM 2Ring Feb 15 at 13:24
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    $\begingroup$ @BogdanBulai Assuming classical GR, the radius of a black hole is determined solely by its mass/energy, irrespective of its origin. Also, you may be interested in an entropy bound - en.wikipedia.org/wiki/Bekenstein_bound $\endgroup$ – Avantgarde Feb 15 at 15:01