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Physics
Special and General Relativity
Oppenheimer-Snyder Model: Overview of Gravitational Collapse
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[QUOTE="Ibix, post: 6838676, member: 365269"] I find it interesting that the collapsing matter doesn't seem to explain the singularity. The singularity is a spacelike line all but one point of which is not in the present/future of the matter distribution when it becomes singular. (I should probably state that in terms of a limit as we approach the singularity, but I don't think my laziness is problematic here.) So all the collapsing matter does is eliminate the obviously crazy aspects of maximally extended Schwarzschild spacetime, and consequently removes all the symmetry evident in a Kruskal diagram. The singularity and the event horizon remain properties primarily of the Schwarzschild vacuum spacetime. And it would still be there (I think) if we put in by hand some mechanism that stopped the matter collapsing at some ##r<R_S##. I suspect I'm not saying anything particularly deep here. In fact, I think I'm just observing in more detail that this isn't a satisfactory model of gravitational collapse. I'm just surprised, not that it goes singular, but at the way it goes singular. I probably need to look closer at the maths. [/QUOTE]
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Physics
Special and General Relativity
Oppenheimer-Snyder Model: Overview of Gravitational Collapse
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