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Consider an observer at a significant distance away from a collapsing star.

As such when a singularity is born at the core of the star the observer would never see it grow anymore than the infinitesimal point it is at the moment of its creation.

This is because the gravitational time dilation at its event horizon would mean any infalling matter would take infinite time to cross the horizon with respect to observers time.

Keep in mind the observer is away from the star and not inside it as answers to similar questions had falsely assumed that otherwise. So the time dilation for the two would be different.

If this is true no Black hole should technically exist for people at earth as the time required for a blackhole to grow from singularity to things like supermassive blackhole at galactic centers would take infinite time from earth's perspective.

Finally this should mean there are only two ways for them exist

  1. If all matter or the universe itself came out of black hole as only in that case we would have equal dilation leading to their formation in finite time

  2. Universe existed since near forever (eternal) .

Qmechanic
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user1062760
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1 Answers1

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That's why they are called "black", it's not a theoretical basis for an argument that they do not exist.

1) They are generally assumed to exist from the gravitational distortions. That is astronomers observe matter orbiting them. The gravity effects are felt outside the event horizon.
2) Additionally when matter approaches the event horizon the gravitational stress can cause some kind of emissions, which get some time dilation, but can escape.
3) Hawking radiation could under theoretical circumstances be detectable, I don;t think it's been done. This is when spontaneously formed virtual particle pairs in free space fail to anihilate as one is captured by the event horizon in the other's frame of reference. 5) Apparently it's also theorised that black hole surfaces are in fact not actually black, but encode some kind of holographic data related to the matter consumed.

Time dilation at the event horizon is not infinite as light can move in "orbits". Light moves, time ticks.

JMLCarter
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