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Can we model the interior of a black hole?


geordief

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Suppose we  convert the Earth (or a similar sphere) into a series of tunnels connecting the surface with the centre (billions of straight tunnels) and build a cavity in the central region to accommodate  billions of  infalling  identical samples of ,say lead ...

What would happen at the centre as all these sample  met  and filled the cavity at the same time? (having been released all at the same time)

Can this be modelled as a scenario (a  computer or theoretical simulation)?

Would the lead  rebound to the surface  repeatedly until it eventually settled in the cavity?

 

Would a black hole form?

 

Would any mass be lost out of a "plug" in the centre (of  the Earth)  in a wormhole fashion?

Edited by geordief
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29 minutes ago, geordief said:

What would happen at the centre as all these sample  met  and filled the cavity at the same time? (having been released all at the same time)

They would slam into each other and melt from the KE.

 

31 minutes ago, geordief said:

Would the lead  rebound to the surface  repeatedly until it eventually settled in the cavity?

The lead would be moving at about 12 km/sec when they hit.  Pretty fast but not fast enough for something crazy to happen.

33 minutes ago, geordief said:

Would a black hole form?

Of course not.

 

34 minutes ago, geordief said:

Would any mass be lost out of a "plug" in the centre (of  the Earth)  in a wormhole fashion?

Of course not.

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7 minutes ago, Bufofrog said:

They would slam into each other and melt from the KE.

 

The lead would be moving at about 12 km/sec when they hit.  Pretty fast but not fast enough for something crazy to happen.

Of course not.

 

Of course not.

What if we increased the mass? "Clearly" we would get nuclear fusion  but are there any denser masses that    might cause anything  different. (are there any denser forms of matter than the elements we know of?)

 

Did the lead accelerate all the way to the centre? Did the acceleration  lessen as it approached the centre?

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27 minutes ago, geordief said:

What if we increased the mass? "Clearly" we would get nuclear fusion  but are there any denser masses that    might cause anything  different. (are there any denser forms of matter than the elements we know of?)

No.  That scenario would not come close to producing enough temperature of pressure for fusion to occur.

 

29 minutes ago, geordief said:

Did the lead accelerate all the way to the centre? Did the acceleration  lessen as it approached the centre?

There would be a roughly linear decrease in the acceleration from 9.8 m/s^2 to 0.

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What if the sphere was larger or more massive than the Earth? Would we get fusion then?

 

And can we also increase  the density of  the objects meeting at the centre (protons?)

 

I am  not suggesting anything practical.

 

Are there any testable theories as to what happens inside a BH? Is it  possible/impossible that there is a region close to the "centre" and another region closer to the "perimeter"? 

 

Is this just an area where nothing is testable or worth speculating about?

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12 minutes ago, geordief said:

What if the sphere was larger or more massive than the Earth? Would we get fusion then?

 

And can we also increase  the density of  the objects meeting at the centre (protons?)

 

I am  not suggesting anything practical.

 

Are there any testable theories as to what happens inside a BH? Is it  possible/impossible that there is a region close to the "centre" and another region closer to the "perimeter"? 

No.

12 minutes ago, geordief said:

Is this just an area where nothing is testable or worth speculating about?

Yes.

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38 minutes ago, geordief said:

What if the sphere was larger or more massive than the Earth? Would we get fusion then?

That could change the initial rate of acceleration of the lead (or whatever). Depending on what the mass and radius actually are.

I'm not sure if lead is a good candidate for fusion at all. It would require a significant input of energy, rather than releasing energy. Although the result would almost certainly be unstable and start to decay by fission.

38 minutes ago, geordief said:

And can we also increase  the density of  the objects meeting at the centre (protons?)

Like the LHC? (which achieves much, much higher speeds, and therefore energy, than your scenario.)

38 minutes ago, geordief said:

Are there any testable theories as to what happens inside a BH? Is it  possible/impossible that there is a region close to the "centre" and another region closer to the "perimeter"? 

We have detailed mathematical descriptions. But none of them are testable because we cannot get any information from inside a black hole. But as current theories predict infinite density at the centre, they are assumed to be wrong/incomplete.

For a rotating (ie. real) black hole, the structure is quite complex with multiple zones outside and inside the event horizon: https://www.forbes.com/sites/startswithabang/2019/06/01/ask-ethan-whats-it-like-when-you-fall-into-a-black-hole/

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You would not get FUSION no matter how much you compress a terrestrial planet.
Fusion can only releases energy up to element 26 ( Iron ), after which, energy must be supplied to bind nuclei together.
Terrestrial type planets have iron/nickel ( and other heavy elements ) cores.
( And yes, FISSION does happen to the heavy nuclei to release heat energy )

Maybe if you were to compress Jupiter...

We can model the interior of a BH's event horizon.
But only according to currently accepted mathematical models.

Thesemodels are incomplete ( as they do not take quantum effects into consideration )
and untestable ( as we will never get information back out of a BH ).

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