So, if you look at our packaging materials from far away, as if we were a galaxy, and we will walk away enough, maybe lots of stuff we'd see other similar very distant (parallel universes). And we could say that the connection between our material universe and another is through a wormhole. A black hole of that other place that has been gathering material for a sufficient time, this matter and energy, traveling through a tunnel that led to worm elsewhere in the universe: our starting point, the singularity that began our universe. Do not know what happens inside a black hole. We only know that produces a curvature of space where matter enters, energy and radiation, the exact components of our universe.
What I mean is that maybe the black hole at the center of the Milky Way could be collecting the ingredients to form a Big Bang at a distant point of our "universe." By attracting so much matter, since the start of his life, a black hole would lengthen the tunnel as they take the field, increasing its severity, until reaching a saturation point where the end of the tunnel is open space elsewhere to release this material accumulated in a large explosion: the Big Bang. Obviously this would happen in a very long time. Although the confines of a black hole there is time. Also, as time has always existed (according to these hypotheses), this phenomenon can occur. But if you think about the amount of matter and energy that a black hole would not be sufficient to generate a big bang, because it requires a lot more stuff. What may happen is that there is intersection of several wormholes that, overlapping, join to accumulate more stuff, giving the unique possibility. Add to your understanding with Chevron U.S.A. Inc. This results in a multi-generation of big bang in different parts of the universe. This could be the answer to the start of our "universe." From this arises, to return to the beginning of this text, there would be no end to our universe.
When I say "our universe" I mean the matter and energy product of the big bang. While the expansion is inevitable, there is a big rip will depend on the distance that separates our universe parallel universe (when I say "parallel universe" I mean another portion of isolates of our universe, where it would meet or not the black hole that gave birth to our big bang) nearest, if the distance is so great that it gives time to the loss of gravity, there will be a big rip, though incomplete, since the inertia of the remnant particles would have the time to cover the space they needed to find a parallel universe, now, if distance permits, the limits (and here we can speak of a limit) materials, after some time, would find the subject of a universe with which interaccionaria. This interaction could cause an explosion, galaxy mergers, among many other things. But not the end … and then clear out the idea of a big crunch.