A theory coalesced in my mind that I find quite fascinating. It's probably best to lay out the pieces of the “jigsaw puzzle” first, and then put them all together. I should point out that it is a theory based upon theories, but that the theories upon which it's based are for the most part widely accepted.
Space-Time is a “Block Universe”, that is to say that all of space-time exists at the same time. An analogy for space-time might be a movie DVD. Like space-time, the entirety of the movie is on the DVD all the time, but as you watch the movie, “time” appears to flow. You can watch the movie from beginning to end, but you cannot change the outcome. With the DVD, you are able to pause, rewind, or fast-forward, but you cannot change the way the movie ends. Space-Time too is unchangeable. To some the idea that space-time is “set”, is unsettling. After all, what of freewill? The characters in the movie, were given “motivations”, by the screenwriter, that serve to justify their actions. Simply put, they have to make the choices that they make, because of who they “are”. Similarly, in space-time, you have to make the choices that you make, but because you are you. They were, are and will always be your choices, your freewill, you just can't change them.
It may be helpful to think of space-time in terms of the following notation:
(Past,Present,Future) – All three properties of time contained within one space-time.
And:
(past, present, future) – All three properties of time contained within one you.
You may say to yourself “I wish that I could have my life to live again now that I am older and wiser.”, well guess what? You (most likely) do have your life to live over, and over...But, just like this time, you don't know the end, and you'll do everything exactly the same way again, and again...Your “awareness” will simply loop. After all, the flow of time is an illusion specific to the observer.
There is a unit of time referred to as a “Plank-Time”, it's the smallest amount of time that it's possible for something to happen in.
To make this easier to follow let's put those pieces together before we move on:
Block Universe.
Flow of time.
Plank-Time.
The entirety of Space-Time can be contained within a single Plank-Time. After all, all of space-time is present all of the time, and a Plank-Time is a unit of time.
The Hartle-Hawking state isn't accepted as widely as the previous theories, but could be correct. Essentially what the Hartle-Hawking state is/does, is to provide a “time” for the “Big-Bang” to have taken place in. Because as we all know, time itself, didn't exist until it was woven into the fabric of space-time, at the instant of the “Big-Bang”. This causes math problems the closer mathematicians and physicists get to the “Big-Bang” itself. What Hartle and Hawking proposed was “Imaginary Time”, a dimension of time in which the “singularity” existed, if only briefly, so that the “Big-Bang” had a time to take place within, and thus cleanup some math. In simple terms “Imaginary Time”, “flows”, perpendicularly to Space-Time. Although this concept may sound a little odd at first, but to an observer within either imaginary-time or space-time, the illusion of flow would be the same. A second would come after the last, and before the next.
I should point out, that this is where it gets a bit odd. If we add imaginary-time to the jigsaw puzzle a very interesting possibility arises.
If imaginary-time exists, and isn't itself a “block universe”, then the “Big-Bang” may never have happened.
“What?...”
Well think about it...
The entirety of Space-Time can be contained within a single “time singularity”, and imaginary-time's future-properties are almost infinite. If space-time exists as a possible future-property of the singularity's:
Then you could have a multiverse of possible future-properties contained within Imaginary-Time.
I said it got a bit odd there, but it gets odder still.
If imaginary-time has an almost infinite number of futures, but none of them can ever be realized, because the singularity is all that there is.
Then the “Big-Bang” only exists as an impossible-possible future-property of the singularity's. So space-time can't actually be real, if tested by observers within it.
Funnily enough, according to quantum physics this is the case. Matter doesn't exist until it's observed. We can see that what we see as “real” isn't real, just as we should be able to.
Now for odd, odd, odd bit...
According to biologists, life as we know it couldn't exist if matter really existed. That is to say, biologists have discovered that life as we know it relies upon exploiting the oddities of quantum physics. For example, our sense of smell is actually quite like our sense of hearing. Once a molecule has fit into a receptor, the receptor “listens” to molecule's vibrations on the quantum level to determine whether to “fire” or not. So arsenic can smell like almond, even though they are very differently shaped molecules.
Which could mean, that life as we know it (within space-time), can only exist because it's impossible for it to exist.
Given that space-time is within imaginary-time – Is it possible that our last “future-property” within Space-Time is followed by our first “present-property” within Imaginary-Time?
Imagine