I got this theory that maybe someone can debunk or prove. I thought of it during a simular BH thread. Here it goes:
1 matter can not travel at or faster then the speed of light
2 angular momentum is conserved for a BH
3 NOTHING has exactly 0.00000000000 angular momentum - there has to be some spin even if the thing rotateds once per million years.
Using 1,2,3 I say that a BH can’t be a point mass since the angular momentum is constant as the BH shrinks the spin (RPM’s) must increase but can only increase to the point that the outer surface is spinning near the speed of light. This speed ‘limit’ prevents the BH from becomming a point mass as the BH can’t shrink any more w/o the mass accelerating past c.
Think about how fast a shadow can move. If you project a shadow of your finger using a nearby lamp onto a far away wall and then wag your finger, the shadow will move much faster than your finger. If your finger moves parallel to the wall, the speed will be multiplied by a factor D/d where d is the distance from the lamp to your finger and D is the distance from the lamp to the wall. It can actually be much faster than this if the wall is at some oblique angle. If the wall is very far away the movement of the shadow will be delayed because of the time it takes light to get there but its speed is still amplified by the same ratio. The speed of a shadow is therefore not restricted to be less than the speed of light.
Others things which can go faster than the speed of light include the spot of a laser which is pointed at the surface of the moon. Given that the distance to the moon is 385,000 km try working out the speed of the spot if you wave the laser at a gentle speed. You might also like to think about a wave arriving obliquely at a long straight beach. How fast can the point at which the wave is breaking travel along the beach?
This sort of thing can turn up in nature. For example the beam of light from a pulsar can sweep across a dust cloud. A bright explosion emits an expanding spherical shell of light or other radiation.When it intersects a surface it creates a circle of light which expands faster than light. A natural example of this has been observed when an electromagnetic pulse from a lightning flash hits an upper layer of the atmosphere.
The shadow/laser/pulsar explantion is not valid since you are not talking about the same object - you are saying basically because a photon is here at one moment and **another totally diffrent ** photon is there at the next moment the ‘thing’ must have traveled at the speed of light.
Who said that BH’s are singularities? You are also ignoring the relatavistic effects on the BH’s mass which allow it to conserve angular momentum without exceeding C.
In Quantum Mechanics, it’s quite possible for something to have exactly zero angular momentum. Any angular momentum less than hbar/2 must necessarily be zero, so it’s not a fine-tuning problem like you might think. We don’t know the physics of a singularity, but it’s a pretty safe bet that quantum mechanics is involved, so we’re OK.
The only part of a black hole which can be directly addressed by current theories is the event horizon, inside of which we can see nothing, and the event horizon is at a finite radius (about a few kilometers, for a stellar-mass hole).
are you sure that 0 is a valid quantum mechanicics #? As I understand quantum theory is that there are exact values for motions but I don’t know if 0 is one of them.
It depends on the particle, but some sorts of particles are allowed to have zero angular momentum. Without a theory of quantum gravity, we can’t really say whether black holes are in this category.