Quote:
Originally Posted by CraigS
Thus restoring a homogeneous, isotropic universe ? I think I'm starting to get the hang of this ..!...?
But .. I think Carl's point is that, by definition, the concept of a 'point of origin' automatically 'violates' the cosmological principle. It's cool that science allows thinking outside of things like this principle. It seems that whenever something comes hard up against it, (or violates it), something really interesting comes out of it.
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But, it doesn't. There's no isotropy or homogeneity...you always have that preferred reference frame, the origin point (which is observable). Not only that, explosions (or a conflagration, which this would be better described as) don't happen in the manner of having everything moving away from the point of origin in a nice orderly manner. The physics just doesn't work like that. In order to have all the galaxies move away at constant velocities dependent on distance (which is not what is seen), you would have to have such a ridiculously smooth and ordered explosion, the chances of it ever happening would be even less than for a BB style of expansion. There would have to be zero turbulence to the explosion and the matter distribution would have to be even smoother than what we do find. It doesn't add up. Explosions are turbulent and lumpy affairs at the best of times. Anything that mixed up would show up in the CMB even now, after all this time. It would also show up in the distribution of matter and energy across the universe. It'd be incredibly lumpy, even on the largest of scales, but that's not what we find.