Here’s something I have been thinking about.
Let’s make the assumption that the theory of the Big Bang is largely correct – in that the universe as we know it originated as a point, from which it expanded, and that the laws of the universe (gravity, mass etc) are constant or at least developed in naturally consistent ways.
To me it then naturally follows that the expansion and evolution of the universe, once set in motion, is entirely predictable.
If I throw a tennis ball at a certain angle into the air, if the forces of the universe are, as we are told, consistent, then with an appropriately powerful calculation involving all factors that affect its flight – gravity, friction, the earth’s rotation, magnetism, relativity etc – I can predict precisely when and where the tennis ball will strike the ground.
If we extrapolate this analogy to the Big Bang, then the velocity – and thus the future – of every single atom in the universe was set at the moment of the event. The insanely complex nature of the calculation over billions of years to predict any event today is not the issue; moreso, that that event IS predictable and IS unchangeable.
It’s only difficult to appreciate because of the scale. Imagine a universe the same as ours in all respects, except for one: the entire universe consists of ten fundamental particles, instead of the untold googleplex of fundamental particles that ours consists of (I don’t mean ten different types of particles, I mean ten individual particles total). At this other universe’s big bang, those ten particles have a mass, a velocity vector, a charge, a rotation etc. It is easier to see that with a consistent or at least consistently evolving set of physical laws, the entire future of that universe is completely predictable. The only difference with our universe is the higher number of particles.
To those that invoke free will, current science argues – and for that matter, I am inclined to believe – that the brain is a purely biological device and is thus subject to the laws of the universe. Thus what passes for free will is really only the staggeringly complex interaction of particles that were set predictably in motion at the moment of the Big Bang.
Only some fundamental uncertainty – a basic property of uncertainty that renders the “laws” of the universe minutely variable – could as far as I understand it free the universe from this rigid predictability.
I don’t make a judgement one way or another – that the Big Bang is a good or bad theory, or that everything that happens is predictable or not. I’m simply trying to understand the implications.
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