Big Bang, Big Crunch & Entropy
The Big Bang is by now by and large accepted as a very robust explaination of the startingpoint of our universe or timeline. The Big Crunch theory is simply an extension of the Big Bang theory, speculating that the universe naturally contraction and explosion (so to speak), going through cycles of Big Bang->Universe->Collapse->New Big Bang. I've been thinking about it, and I think this can be beautifully combined with the notion of entropy (a measure of the amount of thermal energy that cannot be used to do work/a measure of how evenly energy (or some analogous property) is distributed in a system).
First of all, we know that the entropy of the universe is increasing. This have been proven mathmatically, and cannot be denied. As such the heat death of the universe will be a point in time where entropy is absolute, where the entropy of the universe is perfect. However, we know of one point when this have allready been the case: The point just before Big Bang, as nothing existed before this, and as such the energy in the system must have been evenly distributed, as there was none/was all in one point.
As such, it would seem that the notion of Big Crunch might be described somehow connected to our notion of entropy. Just before the Big Bang, we have perfect entropy. Just after, entropy sharply fall as the universe unfold and is filled with matter, energy, everything, and all of it start expending, becoming unevenly distributed. The universe then runs its course, entropy slowly increase again, until we reach a point with perfect entropy again; just like we started with.
It's then not inconceivable that having reach such a point where the starting parameters once more are the same, it can give birth to a new Big Bang, staring the circle all over again. This would mean that our universe could possible be described in terms of entropy as well as in term of matter and energy like we usually does, giving birth to a new, beautiful way to consider the world around us. Of cause, the natural questions here is both 'How can a state of perfect entropy give birth to a new universe?' and 'Is it actually possible to reach a state of perfect entropy, or would one just keep getting a litter closer to it, but never quite there?':
Taking the first question, I must assume that we cannot explain or guess how this is possible, but I'm assuming this has more to do with how we experience the universe more than anything else. I've heard that scientists believe that there exist a lot more than the three dimensions we normally perceive, perhaps as many as 10 or 11, and as such I must assume that seeing only part of the picture, we can't really understand anything properly, but that were we to see it in enough dimensions, everything would make sense, like the concept of a finite universe, how the Big Bang came to in the first place, and so on. So just as Big Bang has once come forth from perfect entropy, so it can come forth again from perfect entropy.
The second is somewhat trickier, much due to the difficulty in knowing what constitues 'perfect entropy' rather than 'near-perfect entropy'. Howevery, I believe we allready got examples of points of perfect entropy in the form on black holes. Black holes seem to break all the rules of the 'normal' universe, such as time standing still, bending space around it, etc. But our concept of time is strongly connected to our notion of entropy, as what we experience as time passing is just entropy changing, and the higher the entropy gets, the harder it is to tell if time is passing, how much, how fast, and the 'timelessness' of the even horizion of a black hole is simply a result of passing from our universe into a system of perfect entropy. And if we accept that black hole are points of infinite entropy, then perfect entropy is possible, and the circle can begin anew, or start again, or begin in the first place, depending on how one view things. And that's both beautiful and terrifying.
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