[who_would_fardels_bear]

There is this thing called the "block universe" theory which suggests that all space-time is an eternal block. The past, present, and future exist at all times. We each are a space-time curve running through this block.

This suggests no free will, or a rather constrained free will that somehow is compatible with determinism, as the future is already set in stone.

In a block universe time travel either will be there or it won't. Some being outside the block would be able to see if there were space-time curves that went backward through time.

[dsc]

When there’s no way to prove or disprove a proposition, speculation can become pretty wild.

IMO, time is just the way our brains deal with the fact that every particle in the universe is in constant motion.