Can a 1kg black hole exist?

  • Thread starter Jarfi
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And if so what would happen if it would be created on earth is there any way to push it out of the orbit could you actually manipulate such a small black hole?
 

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  • #2
Ryan_m_b
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A black hole can be of any size but a 1kg black hole will evaporate long before you can move it. Unless it fell through the floor and ate enough of the world per second to over come its evaporation.

As for moving a black hole theres I'm not sure if perhaps just chucking mass at it will result in it moving. Not my field though
 
  • #3
Janus
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A black hole can be of any size but a 1kg black hole will evaporate long before you can move it. Unless it fell through the floor and ate enough of the world per second to over come its evaporation.
That probably wouldn't even be enough. The estimated exaporation time of a 1 kg BH is 1.44e-17 sec. It would radiating energy away at a rate of 3.6e32 joules/sec, and thus would have to eat matter at a rate of ~4e15 kg/sec just to keep up with the loss.
 
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It would indeed evaporate VERY quickly. Moving a black hole can indeed be done by throwing mass on it from a certain direction, as the total momentum of the system needs to be conserved. For a 1 kg black hole this si still easy (if it wouldn't evaporate), more massive ones are going to need excessive amounts of mass...
 
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A one kilogram blackhole can exist. But it will be microscopic, perhaps even smaller than an electron! Anything can be made into a blackhole there is enough mass in an extremely small amount of space. In other words, any squeezed down enough would turn into a blackhole. The planet Earth weighs much, much more than one kilogram. Earth would turn into a blackhole if it was squeezed down into the size of a marble. So just imagine how much you would have to squeeze down a one kilogram mass to turn it into a blackhole? That's why I said it's microscopic.
 
  • #6
jambaugh
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... Moving a black hole can indeed be done by throwing mass on it from a certain direction, as the total momentum of the system needs to be conserved. For a 1 kg black hole this si still easy (if it wouldn't evaporate), more massive ones are going to need excessive amounts of mass...
If you don't want to increase the mass of the black hole you can "pull" it with another massive body. For example a 1kg black hole at the surface of the Earth will fall at the same 9.8m/s/s rate as will a slug of lead.

Of course where the slug of lead will hit the ground with a thud, the sub-microscopic BH will pass right through the Earth and "orbit" through the ground.

Such a small BH cannot be formed naturally by any stellar process of which we are aware, however speculations have been made that so called Primordial black holes might have formed soon after the BB. One might look for some of theses by moving asteroids around and seeing if there's any mass left in their previous orbit... (also one would look for the Hawking Radiation they would emit.)
 

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