# The Naked Scientists Forum

### Author Topic: Gravity and black hole collapse events  (Read 905 times)

#### jeffreyH

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##### Gravity and black hole collapse events
« on: 09/04/2014 13:16:56 »
As matter becomes more dense and particles move closer together then the gravitational force will increase. The pull on the outermost particles will increase the most as these experience the most force. However, at the centre of the mass gravitation doesn't simply disappear. We see it as the point of complete cancellation of effects. What does this mean? As there is an inward attraction of the outer most particles there must be some force on those particles at the centre. As the forces on those particles at the centre tend to pull out towards the surface, then as gravitational strength increases there should be a tendency for the force to deform mass at this central point. The distribution of this force radially in three dimensions means that it is much weaker than that at the surface. How can this be reconciled with the idea of a singularity?
When the compression reaches the Scwarzschild radius the density will depend upon the initial size of the mass. The escape velocity should always be c at this limit. Therefore initial size and initial density always sum to the correct gravitational energy. Does this difference in density cause different effects at the centre. Alternatively is it purely the ratio of gravitational energy to density that is important.
In these collapsed objects there may still be a gradient of the gravitational field strength through the mass that diminishes towards the centre. As collapse proceeds through the event horizon this may still hold. If it does then the centre will act as a confinement area much like the gluon confinement in protons and neutrons.

#### jeffreyH

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##### Re: Gravity and black hole collapse events
« Reply #1 on: 09/04/2014 13:30:23 »
Concerning the centre of gravity: As an object moves away from the centre, the mass in the opposite direction of travel will exert more force than the mass in the direction of travel. The mass as a whole will tend to pull most in the direction of the centre of gravity. This pull back towards the centre has to start from zero g. As we move further away this g force then increases in proportion to the radial distance from the centre and for the earth will reach 9.78 g at the surface. When viewing this situation with respect to g rather than escape velocity it can be viewed as an analogue of gluon confinement.

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##### Re: Gravity and black hole collapse events
« Reply #1 on: 09/04/2014 13:30:23 »