What is the minimum density required for an object to become a black hole?
I ask this because whenever I research about black holes it is always said to have infinite density or infinite mass.
Possibly using the radius of the sphere as a factor.
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Níckolas Alves
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MaelstromV
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whenever I research about black holes it is always said to have infinite density or infinite mass Could you point to one specific reference for context? In fact, both affirmations are wrong (although discussing the density of a black hole is sort of a delicate matter) – Níckolas Alves Jun 17 '22 at 04:57
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Does this answer your question? What is exactly the density of a black hole and how can it be calculated? – niels nielsen Jun 17 '22 at 05:18
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In our universe with Λ≈1.1e-52/m² the minimum median density of a black hole would be ρ>1.2e-26kg/m³ (the vacuum density) since the maximal BH mass where the BH and cosmic horizons (where gₜₜ=0) pop is 4.3e+52kg with a horizon radius of about 10Glyr: http://notizblock.yukterez.net/viewtopic.php?p=1053#p1053 – Yukterez Jun 18 '22 at 09:16
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@Yukterez Nice, but hypothetical calculations - the universe is not a black hole and has a little chance of becoming one. – safesphere Jun 19 '22 at 04:57
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Density of a black hole is not a well defined concept. For example, as observed remotely, both the volume and mass inside the horizon are zero. A more meaningful question is what density becomes a point of no return in a gravitational collapse before a star becomes a black hole: https://en.wikipedia.org/wiki/Buchdahl%27s_theorem – safesphere Jun 19 '22 at 04:58