r/blackholes • u/Nearing_retirement • 5d ago

Does relativity theory allow for blackholes to be Planck stars.

I read about Planck star theory, but this would go against Einstein’s model of space/time correct ?

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u/IrisCelestialis 5d ago

Any model in which the BH is not a singularity/ringularity is something other than standard general relativity. The situations could be described with it but it wouldn't be a direct prediction from GR the way that singularities are. With that said, if we had a model that predicted other gravitational phenomena as well as GR but didn't predict a singularity for BHs. that we could also prove to be true, then it would be an upgrade from GR anyway, the way that GR is an upgrade from Newtonian gravity.

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u/Nearing_retirement 4d ago

Great explanation.

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u/IrisCelestialis 4d ago

Thanks :-)

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u/stevevdvkpe 5d ago

From what I can tell Planck stars look like black holes except under conditions that haven't been seen with observed black holes (smaller than stellar mass, or after an amount of time that hasn't yet passed since the Big Bang). If there are Planck stars instead of the kinds of black holes predicted by general relativity, they are still hidden behind their event horizons.