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> What if time is 'solid'? You can adopt a perspective where time is solid. But then the question is, why are particles arranged in this solid time exacly as i
by Viliam1234 6y ago
> What if time is 'solid'?
You can adopt a perspective where time is solid. But then the question is, why are particles arranged in this solid time exacly as if they were moving in a real time.
As a metaphor, imagine that you are a god, and you are trying to create a 4D universe with solid time, where the same laws of physics (rephrased in the solid-time language) apply. How would you do it? Ultimately, you would have to create the earlier parts of the solid time first, then the following parts of the solid time, etc, until the end of the universe. It wouldn't work any other way, essentially because of chaos theory; the state at T+1 depends on the details of state at T, so you would have to create the T slice of solid time first, and the T+1 slice later, depending on it.
If you remove the time from the universe naively, you are sweeping it under the rug... into the process that created the universe. But isn't this just adding an extra complexity? If the "process that created the universe" can have real time, why not the universe itself? Isn't this just an extra epicycle?
The only way out is if you used your godlike powers to create all possible states of universe simultaneously -- not just our universe, but literally every possible combination of particles -- and then connect them causally in a way that respects the laws of physics. You don't have to create time T first and time T+1 later, if you create all possible realities first, and then just draw an arrow from each T into the corresponding T+1.
So, instead of the frozen version of our universe (where time = linear movement from the beginning of the movie towards its end), you get a frozen version of everything possible (where time = tracing a path across the everything, following the local currents of causality).
The advantage of the latter model is that you get the parallel universe for free; it just means that local causality is not a single arrow pointing from the current place, but rather a collection of arrows.
But you still need to think (in both models) how to make them compatible with known quantum physics. How to model quantum interference, entanglement, etc.
- meroes 6y agoI think you're adding an assumption that isn't justified, that this god would have had to start at what we call t=0, i.e. big bang. Part of timless physics is that there is no privileged moment in time. The laws of physics allow god to start at any point in the configuration space of the universe and evolve toward any direction. This isn't prevented by chaos theory. Chaos theory happens regardless of where you start your t=0. The laws of physics are 100% symmetric (CPT symmetry). This does not mean we will necessarily recurr either. The laws of physics are symmetric, but due to the Past Hypothesis (prior condition of the universe was very low entropy), we experience an emmergent direction in time, and if the universe is infinite and unbounded it seems like it wont recurr.
- drdeca 6y agoI don’t see the obstacle of making that compatible with QM. Just have the state space which you described (which would be the Hilbert space), and then the Schrödinger equation specifies which curves through the state space are “progression through time”.