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It has been conjectured that our entire universe is a black hole.
A black hole does not have to be super-dense to be a black hole.
QuoteA black hole does not have to be super-dense to be a black hole.I don't understand that statement.If it is not dense, then how can you get deep enough into the potential well to reach an event horizon without being inside some of the mass? Once 'inside' a layer, your potential wrt all of that layer is zero so the potential gradient stops plunging so fast- it bottoms out gracefully to zero before you get a black hole situation.Nicht War?.
I have a feeling that all this is very much related to whether our Universe is Open or Closed i.e is there enough mass (GPE) to use up all the KE of expansion. Once it started to collapse, you would definitely (I think!) get a black hole somewhere - or everywhere.
I should have thought that masses couldn't escape, nor photons. But space itself? That could be another matter.In any case, the idea of a diameter of something that is 'greater' than the space available to plot it on, hurts my brain. It's like using graph paper stuck to a sphere and then trying to plot a point that's further away than the circumference of the sphere. It would either overlay itself on some other point or you'd have to use complex numbers and disappear into another dimension.
I find it rather meaningless to talk of the universe spinning, one can only spin relative to something as far as the universe is concerned there is no 'something'.
QuoteI find it rather meaningless to talk of the universe spinning, one can only spin relative to something as far as the universe is concerned there is no 'something'.Actually, if I were in a darkened room, in a vacuum, I could quite easily tell whether I was spinning or not because I would be aware of a centrifugal force and a Coriolis force ; geometry and mechanics would tell me I was spinning. I would not need to refer to any other, outside frame.You could imagine some measurement that might show the existence of similar effects in the Universe that could be explained in terms of the whole thing rotating.
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REGISTER or LOGINI too have just read this and I have long held this view that the Šther must be replaced by the sea of quantum particles