Pauli Exclusion Principle and Black Holes

In summary: The fact is that we simply don't know what happens beyond the event horizon of a black hole. Is there a singularity? Is there some sort of exotic super unstable matter made out of quarks and leptons that is only made stable via the immense force of gravity? Perhaps constant creation-annihilation events? No one knows.In summary, we don't know what happens after the degeneracy of a neutron star. Some theorize that there is some sort of exotic matter that only becomes stable through the immense force of gravity, while others think that there is a singularity. We also don't know what the Pauli exclusion principle is indicative of.
  • #1
cdux
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I understand that there may be no answer to the question "Why is Pauli Exclusion Principle not applied beyond a Neutron Star's mass?" since there may not be a full quantum gravity theory yet, however, I'm thinking, what if Pauli Exclusion Principle is not really a principle, but an indication that there is a force, a strong reactive force to the formation of Black Holes that can be overcome only under extreme masses?
 
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  • #2
cdux said:
I understand that there may be no answer to the question "Why is Pauli Exclusion Principle not applied beyond a Neutron Star's mass?" since there may not be a full quantum gravity theory yet, however, I'm thinking, what if Pauli Exclusion Principle is not really a principle, but an indication that there is a force, a strong reactive force to the formation of Black Holes that can be overcome only under extreme masses?

Because after the degeneracy of a neutron star, the gravity is strong enough to overcome whatever force is holding the matter up, the Pauli-exclusion principal or the electro-magnetic repulsion of particles just isn't enough, gravity is too strong, and what actually happens after the degeneracy of a neutron star is unknown.
 
  • #3
The fact is that we simply don't know what happens beyond the event horizon of a black hole. Is there a singularity? Is there some sort of exotic super unstable matter made out of quarks and leptons that is only made stable via the immense force of gravity? Perhaps constant creation-annihilation events? No one knows.

Anyways, saying that the pauli exclusion principle doesn't hold up beyond a neutron stars mass may or may not be true. I know I've read about theorized stars composed of quark matter which is even denser than neutrons. Since these have yet to be observed we just can't say either way yet.

what if Pauli Exclusion Principle is not really a principle, but an indication that there is a force, a strong reactive force to the formation of Black Holes that can be overcome only under extreme masses?

Unlikely. To my knowledge the principle only describes the fact that the wavefunction of two identical spin 1/2 particles cannot overlap exactly. Something to do with one of them having to be anti-symmetric to the other. I'm not real sure on the details. See here for more: http://en.wikipedia.org/wiki/Exchange_interaction
 
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  • #4
I'm not an expert in this. But I've also heard something about "degeneracy pressure" which is also mentioned by those posted.

In a white dwarf, the factor that resists collapse is the electron degeneracy pressure. But when the mass has reached certain level electron degeneracy pressure is not enough, leading to further collapse into a neutron star. Whereby, electrons are caught by protons and become neutrons via process similar to Beta reaction. And on that occasion neutrons would provide degeneracy pressure which is stronger.

And theoretically, there are quark stars, but they are not discovered by any means.

Well, in my perspective, Pauli exclusion just says that free fermions are not likely to be in the same state, but under immense potential they can be forced to collapse.

But in the sense of black holes, we have no means to determine whether matter in black holes are still in the form of fundamental particles.
 
  • #5
ZealScience said:
Whereby, electrons are caught by protons and become neutrons via process similar to Beta reaction.

Hmm, that's what I use to think that too, but electrons can actually exist inside the nuclei of atoms without fusing with them due to their wave mechanics, and they are in a higher energy state if they are forced below their ground state.
 
  • #6
If you can believe it, I've had this thought too. Specifically, that perhaps another avenue and approach to quantum gravity is by considering the relationship between the Exclusion principle and the shape of space time. We know these two things are related even without considering black holes; they are in a balance during normal star operations in the form of "degeneracy pressure."

Perhaps it isn't that deep, but I think some thought should go in this direction.
 
  • #7
questionpost said:
Hmm, that's what I use to think that too, but electrons can actually exist inside the nuclei of atoms without fusing with them due to their wave mechanics, and they are in a higher energy state if they are forced below their ground state.

But I don't think that it is so in this case. Under immense gravity, this type of beta decay is very possible. And I think that this reaction is energy releasing (well, not quite sure); therefore, it more likely to happen.

I haven't learned about anything about that "below state". I think that the orbital angular momentum number was said to be 1 less than the principle quantum number (which is the total angular momentum, characterized by OAM operator L2). With smaller principle quantum number, how is the system possible (because L2 is always positive)?

I am just being a little skeptical here. I am most likely to be incorrect.
 
  • #8
ZealScience said:
And theoretically, there are quark stars, but they are not discovered by any means.
What if Quark Stars are Black Holes and the Event Horizon coincides with the demolition of the Pauli Principle?
 
  • #9
ZealScience said:
But I don't think that it is so in this case. Under immense gravity, this type of beta decay is very possible. And I think that this reaction is energy releasing (well, not quite sure); therefore, it more likely to happen.

Inverse beta decay does not release energy. It takes an electron, combines it with a proton and forms a neutron, which is more massive than the proton and the electron, so it requires energy to create. My understanding is that under the pressures at neutron star density, it is simply more favorable to occur because it would require MORE energy for the electron to remain outside the nucleus in those conditions. In degenerate material, as the pressure increases the electrons are pushed closer together, but also acquire more energy, as the HUP says that since their position is constrained more and more then their momentum must become more uncertain. At a certain point the energy of the electrons become so great that inverse beta decay starts.

http://en.wikipedia.org/wiki/Degenerate_matter

cdux said:
What if Quark Stars are Black Holes and the Event Horizon coincides with the demolition of the Pauli Principle?

As far as I know, a quark star would be more dense than a neutron star, but not have an event horizon yet. If it did, then it would be a Black Hole and not what we call a Quark Star.
 
  • #10
Drakkith said:
Inverse beta decay does not release energy. It takes an electron, combines it with a proton and forms a neutron, which is more massive than the proton and the electron, so it requires energy to create. My understanding is that under the pressures at neutron star density, it is simply more favorable to occur because it would require MORE energy for the electron to remain outside the nucleus in those conditions. In degenerate material, as the pressure increases the electrons are pushed closer together, but also acquire more energy, as the HUP says that since their position is constrained more and more then their momentum must become more uncertain. At a certain point the energy of the electrons become so great that inverse beta decay starts.

http://en.wikipedia.org/wiki/Degenerate_matter



As far as I know, a quark star would be more dense than a neutron star, but not have an event horizon yet. If it did, then it would be a Black Hole and not what we call a Quark Star.

Oh, sorry, I didn't look upon those. But if electrons have higher energy out side the nucleus, does it mean that, in the situation, electrons' relativistic mass is greater than those in normal atoms?

And I don't think that quark stars have already become black holes, since inside the event horizon, particles cannot communicate; therefore, in my perspective, no repulsion is likely to build up between quarks.
 
  • #11
ZealScience said:
Oh, sorry, I didn't look upon those. But if electrons have higher energy out side the nucleus, does it mean that, in the situation, electrons' relativistic mass is greater than those in normal atoms?

I don't think there's any reason to talk about relativistic mass, as that is an outdated concept as far as I know. (Or at minimum it is just confusing) I'd just stick to energy to keep everyone on the same page. Anyways, the electrons in degenerate matter are all jam packed into lots of energy levels in a way that is different from normal matter. In these higher energy levels the electrons have much more energy than they could in normal matter I believe.

And I don't think that quark stars have already become black holes, since inside the event horizon, particles cannot communicate; therefore, in my perspective, no repulsion is likely to build up between quarks.

What do you mean? Particles inside the event horizon can and do communicate with each other. It is quite possible for you to fall inside the event horizon of a supermassive black hole and still be alive, as the gravitational gradient is very small.

But more to the point, even if the matter inside a black hole was in a quark degeneracy state, it would still be called a black hole, as it has an event horizon for light. If it did not have an event horizon then it would not be a black hole.
 
  • #12
Drakkith said:
What do you mean? Particles inside the event horizon can and do communicate with each other. It is quite possible for you to fall inside the event horizon of a supermassive black hole and still be alive, as the gravitational gradient is very small.

But more to the point, even if the matter inside a black hole was in a quark degeneracy state, it would still be called a black hole, as it has an event horizon for light. If it did not have an event horizon then it would not be a black hole.

Sorry, I mean near the singularity. In models schwarzschild black hole, the light cones end at the singularity point and therefore the particles near the singularity would collapse.
 
  • #13
ZealScience said:
Sorry, I mean near the singularity. In models schwarzschild black hole, the light cones end at the singularity point and therefore the particles near the singularity would collapse.

At that point current accepted models simply break down. There isn't any way to know at this point in time.
 
  • #14
cdux said:
I understand that there may be no answer to the question "Why is Pauli Exclusion Principle not applied beyond a Neutron Star's mass?" since there may not be a full quantum gravity theory yet, however, I'm thinking, what if Pauli Exclusion Principle is not really a principle, but an indication that there is a force, a strong reactive force to the formation of Black Holes that can be overcome only under extreme masses?
The standard theory of black holes emerging from stars assumes that the Pauli principle IS valid in black holes.
 

1. What is the Pauli Exclusion Principle?

The Pauli Exclusion Principle is a fundamental principle in quantum mechanics that states that no two fermions (particles with half-integer spin) can occupy the same quantum state simultaneously. This means that in a system of fermions, each particle must have a unique set of quantum numbers, including spin, energy, and momentum.

2. How does the Pauli Exclusion Principle relate to black holes?

The Pauli Exclusion Principle plays a key role in the formation and behavior of black holes. As a star collapses under its own gravity, its core becomes incredibly dense, with a large number of particles occupying a very small space. According to the Pauli Exclusion Principle, these particles cannot have the same quantum state, so they must pile up on each other, creating immense pressure that prevents further collapse. This pressure is what supports the structure of a black hole.

3. Can the Pauli Exclusion Principle be violated in black holes?

No, the Pauli Exclusion Principle is a fundamental principle of quantum mechanics and cannot be violated. However, in extreme conditions such as those found in black holes, the principle can lead to some seemingly paradoxical effects, such as the existence of a singularity at the center of a black hole where the laws of physics break down.

4. How does the Pauli Exclusion Principle affect the behavior of matter in the vicinity of a black hole?

The Pauli Exclusion Principle plays a crucial role in the behavior of matter near a black hole. As matter falls towards the black hole, it becomes increasingly compressed and heated due to the immense gravitational forces. At a certain point, the matter may reach a state known as a degenerate matter, where the particles are so tightly packed that they can no longer be compressed. This is due to the Pauli Exclusion Principle, which prevents the particles from occupying the same quantum state and therefore cannot be squeezed any further.

5. How does the Pauli Exclusion Principle contribute to our understanding of black hole thermodynamics?

The Pauli Exclusion Principle is a key factor in understanding black hole thermodynamics, which describes the behavior of black holes in terms of temperature, entropy, and energy. The principle dictates that as matter falls into a black hole, its entropy (a measure of disorder) increases, which contributes to the overall entropy of the black hole. This helps explain the second law of thermodynamics, which states that the total entropy of a closed system always increases over time, including in the case of black holes.

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