Why is a black hole with q>e singular?

In summary: Originally posted by Loren Booda Creator, One must achieve the singularity first. In other words, can you derive a minimum net charge/mass relation for collapsing matter to attain a black hole? No, there is no minimum mass needed for a black hole (though obviously one formed by stellar evolution has a minimum mass) and charge doesn't enter into it. Bogdan, q>e means the net collapsing discrete charge, q, is at least 2 times the electron charge, e, in order for like charges to repel.
  • #1
Loren Booda
3,125
4
Black holes have the properties of angular momentum, mass, and charge. Since electromagnetism is a much stronger inverse-square force than gravity, and like charges repel, wouldn't a black hole with charge q>e avoid singularity?
 
Physics news on Phys.org
  • #2
No, this is how a black hole is formed, i.e. the gravitational pull of the star becomes greater than the degenracy pressure caused by electromagnetism and the like.
 
  • #3
Even when a mass is collapsed beyond degeneracy to neutronium, any net charge its eventual "singularity" harbors still retains the property of predominant repulsion.
 
  • #4
Originally posted by Loren Booda
Black holes have the properties of angular momentum, mass, and charge. Since electromagnetism is a much stronger inverse-square force than gravity, and like charges repel, wouldn't a black hole with charge q>e avoid singularity?

Well Loren,..who says inverse square law holds true inside a singularity?:wink:

Creator
 
  • #5
Creator,
One must achieve the singularity first. In other words, can you derive a minimum net charge/mass relation for collapsing matter to attain a black hole?
 
Last edited:
  • #6
Originally posted by Loren Booda
Creator,
One must achieve the singularity first. Is there a minimum net charge/mass for attaining a black hole?

Beats me; I've not heard of such a calculation. However, even before going singular 1/r^2 likely becomes deficient.

Creator
 
Last edited:
  • #7
What does q>e mean ?
 
  • #8
Originally posted by Loren Booda
Creator,
One must achieve the singularity first. In other words, can you derive a minimum net charge/mass relation for collapsing matter to attain a black hole?

There is no minimum mass needed for a black hole (though obviously one formed by steallr evolution has a minimum mass)and charge doesn't enter into it.
 
  • #9
bogdan, q>e means the net collapsing discrete charge, q, is at least 2 times the electon charge, e, in order for like charges to repel.

jcsd, the minimum mass for a black hole is M*, the Planck mass. This quantity derives from the absolute radiative constants c, G and h. Only quanta or their composites weigh less.
 

1. Why is a black hole with q>e singular?

Black holes with q>e, or a charge greater than the mass of the black hole, are considered singular because the equations of general relativity break down at the singularity. This means that we do not fully understand the physics at this point, and it is a subject of ongoing research and debate.

2. How does the charge affect the singularity of a black hole?

The charge of a black hole affects the singularity by altering the shape and properties of the event horizon. A charged black hole has an inner and outer event horizon, and the singularity lies between these horizons. The charge also affects the strength of the gravitational pull at the singularity.

3. Can a black hole with q>e still exist in nature?

It is currently unknown if black holes with q>e can exist in nature, as the conditions required for such a black hole to form are not fully understood. However, some theories suggest that primordial black holes with q>e may have formed in the early universe, and they could potentially exist in extreme environments such as near supermassive black holes.

4. What would happen if a charged object fell into a black hole with q>e?

If a charged object were to fall into a black hole with q>e, it would experience a force known as the Coulomb force, which is similar to the electromagnetic force. This force would cause the object to repel from the singularity and potentially prevent it from reaching the event horizon. However, the exact behavior of the object would depend on its mass, charge, and the strength of the gravitational pull.

5. How does the singularity of a black hole with q>e differ from a non-charged black hole?

The singularity of a black hole with q>e differs from a non-charged black hole in several ways. One key difference is that the charged black hole has an inner and outer event horizon, while a non-charged black hole only has one event horizon. Additionally, the singularity of a charged black hole has a different shape and properties due to the presence of the charge. The behavior of particles and objects falling towards the singularity also differs between charged and non-charged black holes.

Similar threads

  • Special and General Relativity
Replies
12
Views
331
  • Other Physics Topics
Replies
6
Views
6K
Replies
4
Views
620
  • Special and General Relativity
Replies
3
Views
1K
  • Special and General Relativity
Replies
3
Views
953
  • Special and General Relativity
2
Replies
62
Views
3K
  • Special and General Relativity
Replies
32
Views
1K
  • Special and General Relativity
Replies
4
Views
365
Replies
108
Views
17K
  • Special and General Relativity
Replies
11
Views
686
Back
Top