[QUOTE=AnonyMouse]

As far as I can understand, there still needs to be some first cause, Prime Unmoved Mover (call it God or whatever) behind the constant change, even though the development of the universe would be seen as a never-ending cycle. There is no movement without a cause. There are no phenomena without a cause.

[QUOTE]

I suggest you read up on quantum mechanics. Quantum entaglement for example goes beyond the ideas of cause and effect.

To answer some previous questions, the universe will not become one black hole. Black holes radiate heat and eventually evaporate. So not even black holes last forever.

The inflationary model of the universe is rapidly being accepted by scientists rather than the big bang. As the inflationary model tries to explain the universe came from nothing and explains the big bang as well as other pieces of data which the big bang could not explain. It follows from the quantum idea of how particles can for short periods of time become real from the vacuum energy then dissapear back into the vacuum energy.

So if a quantum bubble appears out of the vacuum energy and inflates very quickly then a stable universe which includes a big bang as well as parralel universes can exist. The theory also explains other stuff which the big bang could not. Seeing is the inflationary theory explains what the big bang could and a lot more its probably going to be the next accepted theory. However, more experimental evidence would be required.