Perpetual Universe?

Question

The current theory of the universe is an endless cycle of Big Bang to Big Crunch to Big Bang to Big Crunch to Big... If this is true and considering the current physics law where
1. The total amount of energy is the same,
2. Energy can't be created nor destroyed,
3. Action will be met by reaction,
then what exactly cause the whole universe to endless evolution? It seems like the universe itself is a perpetual self-sustaining form of existence. Some sort of perpetual motion.

If we swing a pendulum in space, it will eventually stop due to gravitation but why the universe can't stop? If there's nothing outside the universe, then the universe itself must be a form of self-sustaining perpetual motion existence, making physics law void.

What's your comment?

Answer 1

If the theory of perpetual universe is correct (while i dont believe in it, it is a good theory anyway) then it would not slow down.

A pendulum slows down because it looses energy to the surrounding environment, this is because a pendulum is not alone. According to a perpetual universe theory the universe is alone... the universe is EVERYTHING, so there is nothing else to loose energy to since any energy becomes reincorporated into it.

The big crunch for example is caused because EVERYTHING pulls together, and this causes a big bang causing EVERYTHING to reexpand, then recontract etc.
The secret is to realise that "everything" is absolutely "everything", if only one photon of light escapes the crunch each time then it does stop, but this should not happen as it would be pulled back to the crunch due to the huge forces involved.

EDIT:
For those that say the universe will continue expanding:
Einstein said it would not happen
Einstein said he was wrong, and Hubble said it would expand
Einstein was proved right (thereby proving he was wrong in saying he was wrong)
Arguments that Einstein was wrong to start with.
Physicists argue perpetually still.

Hey! this is like a constantly expanding and contracting universe. The reality is that no one really knows what is going on.

Answer 2

Not true, the current accepted theory is there is not enough mass to cause a crunch, and that the universe will expand forever, until eventually each star will be too far away from others to see them. In fact, the rate of expansion is currently speeding up due to the dark force, and has been for the last 6 billion years.

And, it is postulated the Big Bang was set off by a random quantum fluctuation. You can have this, and even though unlikely, if you have an eternity to wait it will happen eventually. (it is only postulated because the Big Bang theory only starts about 10^-30 seconds after the Big bang, it does not address the Bang itself)

I suggest you get and read Greene's book, The Fabric of the Cosmos. He goes into the most recent understanding of cosmological events, but the book is readable and accessible even to us mortals.

Answer 3

Not true.

1. There may not be enough mass in the universe to cause a "big crunch". Current indications are that there is not.

2. Even if there was, a big crunch could not be followed by a big bang because this would violate the laws of thermodynamics - basically, the big bang is the lowest state of entropy the universe ever had, and a black hole has the highest density of entropy possible.

Answer 4

Actually, the current indications are that the universe will continue to expand indefinitely. In fact, the rate of expansion is increasing. The general theory of relativity predicts that he universe could also come to the end of its expansion and collapse on itself eventually. That model does not predict that the expansion will start again with another "big bang", but that concept was suggested. What "causes" it is the nature of the gravitation as described by the general theory of relativity.

Answer 5

The universe is a finite entity that will eventually go out of existence.
Controversial as it may sound,it came from nothing that had a finite potential it will return to an eternal nothing with no potential.
It is an incident that happens once and will never happen again

Answer 6

If nothing outside our universe is effected by our universe, then its net energy is zero.