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I've often pondered on This.
My minds eye likes the idea that the mass of the universe will eventually be so great that expansion will slow, then contraction will occur. Towards the end I could only imagine that the particles finally converging on each other would occur at such velocity and such a small point in spacetime that in essence an ultra-massive black hole would be the result.
I am far from a physicist however I would like to think this black hole would collapse upon itself with no matter left to feed it, possibly creating an inverse effect, possibly spewing particles out in an alternate universe on the other side of its event horizon. The end of one universe sparking the birth of another.
I'd love to hear from someone with a background in astrophysics to know if this "by the seat of my pants" hypothesis is even remotely plausible.
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