What Happens to Mass Inside a Black Hole?

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Discussion Overview

The discussion centers on the nature of mass inside a black hole, exploring concepts such as the existence of mass, the effects of time dilation and length contraction, and the implications of singularity as described by classical general relativity and quantum mechanics. The scope includes theoretical considerations and interpretations of existing literature.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question whether mass exists inside a black hole and discuss the implications of relative velocity between an observer and mass within a black hole.
  • It is noted that, according to classical general relativity, mass inside a black hole is infinitely compacted at the singularity, but this mass may not resemble everyday matter.
  • One participant suggests that while mass is inaccessible to outside observers, a body crossing the event horizon may still exist for some time outside the singularity.
  • Another participant references Dr. Susskind's argument that the Heisenberg uncertainty principle may prevent a singularity from having infinite density, suggesting that "quantum jitters" could cause the singularity to spread out.
  • A question is raised regarding the maximum density predicted at the center of a black hole when considering quantum effects.
  • There is a technical inquiry about the assumptions underlying the Heisenberg uncertainty principle in relation to black hole singularities.

Areas of Agreement / Disagreement

Participants express differing views on the nature of mass inside black holes and the implications of singularity, with no consensus reached on the maximum density or the effects of quantum mechanics on singularities.

Contextual Notes

Limitations include the dependence on interpretations of general relativity and quantum mechanics, as well as unresolved questions regarding the behavior of mass and density at singularities.

epkid08
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Does mass exist inside a black hole?

What is the relative velocity between say me, and some mass inside of a black hole?

To what degree of time dilation/length contraction does mass inside of a black hole experience?
 
Physics news on Phys.org
Try reading wikipedia at BLACK HOLE

http://en.wikipedia.org/wiki/Black_hole#Singularity


The mass inside, although not accessible to observers outside the event horizon, is infinitely compacted at the singularity inside according the classical general relativity. But this is not mass as we know it in everyday experience. Atoms, protons and electrons, for example, have been crushed to some unknown fundamental constitutents. And time and space are also mashed beyond recognition, perhaps to their fundamental constitutents.

There is not necessarily any motion between you and a black hole if you are a stationary outside observer; if you are falling in toward the black hole attracted by the gravity then of course there would be.
 
Naty1 said:
The mass inside, although not accessible to observers outside the event horizon, is infinitely compacted at the singularity inside according the classical general relativity.

That is the final static condition. In the dynamical regime, a body crossing the black hole horizon will exist for some time "outside" the singularity.
 
According to the Wikipedia article on Black holes:
"At the center of a black hole lies the singularity, where matter is crushed to infinite density, the pull of gravity is infinitely strong, and spacetime has infinite curvature.[37] This means that a black hole's mass becomes entirely compressed into a region with zero volume.[38] This zero-volume, infinitely dense region at the center of a black hole is called a gravitational singularity." http://en.wikipedia.org/wiki/Black_...quantum jitters" is appropriately considered?
 
that the Heisenberg uncertainty principle precludes a black hole singularity of infinite density.
Is it after assuming change in position and that in velocity0?
[m*delta(v)]delta(x)=>h/2 delta(v) and delta(x) are small enough that m->infinity
 
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