Yahoo Answers: Answers and Comments for If a gravitational singularity is infinite in any physical quality why doesn't it take up infinite space? [Astronomy & Space]
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From Josh Alfred
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Wed, 06 Dec 2017 07:40:45 +0000
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Yahoo Answers: Answers and Comments for If a gravitational singularity is infinite in any physical quality why doesn't it take up infinite space? [Astronomy & Space]
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From Raymond: "Singularity" is a mathematical obje...
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Wed, 06 Dec 2017 19:46:26 +0000
"Singularity" is a mathematical object that belongs to the domain of a function.
It does not need to be infinite. It does not need to be a point (in some functions, the "sigularity" is a volume, sometimes finite, sometimes infinite).
We have no idea what a "gravitational singularity" means.
In the Big Bang theory, the "singularity" is a time interval: the time interval that falls "before" the Planck Time, the first moment that can be understood with the Big Bang thoery (that moment, 13.8 billion years ago).
AT the Planck time, nothing is infinite, nothing is infinitely small. Values are finite.
IF (a big if) you attempt to push the mathematical model outside of its domain (meaning = "before" the Planck Time), energy density grows without bound. But that is because we do not understand how time itself "flows" above the Planck value for energy density (itself a finite value).
Bluntly: we do not know what the word "before" really means. So that if you try to go "before"... you are on your own.
At the Planck Time:
 The initial energy already existed.
 Space was already expanding.
 Energy density was NOT infinite.
 We think gravity already existed.
 We know matter did not yet exist (it comes later and the theory does explain how).
this next one is conditional:
IF (a big if) the universe is now infinite in spatial extent, then it was already infinite at the Planck Time.
How was it "before"? We don't know, since we do not know that the word "before" means when you apply it to the Planck Time.
It is (a bit) like asking: how fast can you pour a glass of water, once the water is frozen in the glass.
At energy densities above the Planck density... time is "frozen" (and we do not know what that means, either).

From ?: Infinite density, that's what they're ...
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Wed, 06 Dec 2017 10:00:22 +0000
Infinite density, that's what they're talking about, which basically means it couldn't be any more dense, it's packed as tightly as it can be. The electron collapses and stops spinning around the nucleus, taking away an estimated 99.99% of the volume, but not the mass, so it has massive gravity, in a small space, but from a distance, it still has the same gravitation pull. The difference is, when you go into it, there's no coming back out, for anything, and I believe that includes dark energy, even though that's a completely unknown thing.
That's the force that is supposed to be pushing the expansion of the universe, but they only assume it's there because the universe appears to be speeding up in expansion. I reckon it's just the subatomic particles bouncing around, pushing against each other causing outward pressure and also pulling the universe with their own gravity. I believe all forms of energy have gravity, and that they've already fallen into the massive black holes that exist now, such as the ones in the middle of just about every galaxy, millions of stars in mass.
So, rather than continuing to push the expansion, my theory is that this energy, dark energy will add to the mass and gravity of the black holes, the stars will burn out, turning into more black holes, which will then form orbits and fall into each other, with black hole cluster galaxies forming and moving into smaller and smaller denser regions of space where all the mass is, and in between these places, absolutely nothing, so gravity will be the only force left, causing the collapse, and when huge black holes containing all the mass/energy in the universe smash together at the speed of light, big bang.

From neb: Most people don’t seem to understand the natur...
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Wed, 06 Dec 2017 18:21:08 +0000
Most people don’t seem to understand the nature of a singularity. A direct solution of General Relativity has something called a curvature invariant. This is a kind of average curvature that can be computed at any point in space. The curvature invariant becomes infinite at the center of a black hole meaning that at least one component of CURVATURE has to be infinite. It says nothing about things like density.
There are proofs (both Hawking and Penrose) of singularities, subject to some assumptions about the type of energy in a black hole that give a better idea of what a singularity is. These proofs are based on geodesic incompleteness. A geodesic is the shortest distance between two points in spacetime. These proofs state that ALL geodesics within the event horizon terminate at the singularity  there is no ‘next point’ on the geodesic.
It’s important to note that the energy assumptions that were made in singularity theorems are probably not correct and singularities likely do not exist. There are quantum gravity effects that may prevent singularities from forming, and there are also extensions to general relativity such as the EinsteinCartan theory that posit that densely packed quantum spins will introduce a torsion to space (original relativity is nontorsional) that will produce a repulsive gravity that prevents the singularity.

From Tom S: The only "physical quality" which a ...
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Wed, 06 Dec 2017 17:08:59 +0000
The only "physical quality" which a singularity might have as "infinite" would be density, which would follow if it did in fact contain any matter at a zero volume (space). In fact that basically is the definition of singularity. Many physicists believe that is not the case, the "zero volume" is just a "mathematical convenience", and infinity an abstract concept.

From quantumclaustrophobe: Even if you took all the mass in the universe,...
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Wed, 06 Dec 2017 16:56:22 +0000
Even if you took all the mass in the universe, crunched it down to a black hole  it would have one *huge* event horizon  but, it still would be rather small when you compare it to the rest of the universe.

From ?: If being the key word. It isn't
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Wed, 06 Dec 2017 16:19:25 +0000
If being the key word. It isn't

From Satan Claws: <QUOTE>a gravitational singularity is in...
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Wed, 06 Dec 2017 08:49:59 +0000
<QUOTE>a gravitational singularity is infinite in any physical quality</QUOTE>
It is not. Counterexample: its width.
I don't know what is a "physical quality", I only know about physical quantities.

From Enough Trolls: No singularity has yet formed (time dilation)....
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Thu, 07 Dec 2017 16:13:22 +0000
No singularity has yet formed (time dilation). No singularity is or ever could be infinite because that would be more than the Universe. So the question is null.

From ?: Density...........................
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Wed, 06 Dec 2017 19:05:13 +0000
Density...........................

From goring: A singularity cannot move unless a cause is id...
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Wed, 06 Dec 2017 21:03:09 +0000
A singularity cannot move unless a cause is identified.