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Aug 6, 2022 at 7:50 comment added KeizerHarm @VogonPoet temporal dimension=flow of time=temporal axis. It's a direction like X and Y and Z. A timeline is a sequence of events that flow along such a direction. And I'm afraid I don't know how I'm misusing the word causal, but I suppose that's what the second question will be for.
Aug 5, 2022 at 22:20 comment added Vogon Poet I would suggest disambiguating the term “temporal dimension” and the thing you want to flow along a perpendicular axis. You will use words like “causal” and we little helpers will hear that term in its canonical sense then scratch our heads.
Aug 5, 2022 at 22:14 comment added KeizerHarm @VogonPoet I see a separate question about causality with perpendicular timelines is warranted, leaving aside the problem of observation. I will create one in good time. Thanks for your thoughts.
Aug 5, 2022 at 22:07 comment added Vogon Poet If a causal act happened in a perpendicular timeline… whatever that empirically resolves to, then there would be some stochastic relation between these events and the perpendicular flow. The math checks, but… what the heck does that mean? Math says we can divide things in two infinitely. But try it with a Hydrogen atom, and… you see? Your chart doesn’t correlate to an observable phenomenon.
Aug 5, 2022 at 21:58 comment added Vogon Poet @KeizerHarm there’s no problem with that model except that it defies any ability to be scrutinized under scientific rigor. We rely on a linear flow of time for all causal observations, so you literally can’t make their activities look logical or causal from our perspective. They would be miracle workers, whose actions are immune to prediction or prevention. Make the world, don’t expect it to make sense. They are essentially gods.
Aug 5, 2022 at 21:53 comment added KeizerHarm @VogonPoet Interestingly, my working theory is that seemingly spontaneous events like radioactive decay were in fact triggered by a causal chain of events in the perpendicular timeline. That folds the appearance of time travellers into the same system as quantum scale randomness.
Aug 5, 2022 at 15:49 comment added Vogon Poet As an example, radioactive decay has no cause. It is known in physics as a spontaneous event which can neither be made to happen, prevented from happening, not altered in any way from the timing of its happening. An atom of C14, for example, shall "decay" as an event which is not caused. The term for such things is "spontaneous." Events time travelers effect, acting outside the linear flow of observed time, would appear as spontaneous events, and would defy any attempt to "measure" or "predict" or "alter" them in any way. They would be proper miracles. One could not "look at" them.
Aug 5, 2022 at 15:43 comment added Vogon Poet Causality has a rigid definition inextricable from the linear flow of time. Three components must decide a causal relationship: Covariation, temporal precedence, and non-spuriousness. If Event A were "caused" by Act A, then we KNOW three things: 1) When Act A is performed, Event A is observed. 2) Event A was observed after Act A was performed, in the timeline of all affected events (the universe of all possible events). 3) Event A and Act A don't relate as a mere coincidence. Fail any of these and your relationship is not a causality, by definition.
Aug 4, 2022 at 22:21 comment added Willk There may very well be folks in the 4D line who are meddling in the 3D blue line timetravellers' timelines just like those 3D blue folks meddle in the 2D red folks timelines. The 4D folks have plaid squiggly lines and are exponentially smugger and sassier than the 3D blue folks are. The 5D ones though have beige squiggly lines and are pretty chill; maybe a little melancholy.
Aug 4, 2022 at 13:41 comment added Halfthawed A line simply connects two points. If the points are in multiple dimension, it's easy for the line to be in multiple dimensions.
Aug 4, 2022 at 13:10 comment added KeizerHarm Interesting thing to consider. I do want the time travellers' timeline to be simply causal, because that's the timeline that the narrative follows. If their timeline is still simply a line then how does it have more dimensions than one?
Aug 4, 2022 at 12:38 history answered Halfthawed CC BY-SA 4.0