It's 3am and I'm thinking about time travel and physics.
I don't know math and this is mostly fed by documentary listening. These aren't insights to be shared, it's just me articulating thoughts that are most likely fundamentally wrong but I'm not equipped to shake.
So, like, I don't really get what's wrong with retrocausal qm interpretations, probably because no math. Going on naive intuitions I feel like it gels with general relativity pretty well and can lead to a non-local account for things.
Time in gr is pretty much just another direction.
So block universe. I guess I'm not entirely clear what an 'event' is, but I guess excitement in some qm field. I guess I imagine it propagating (not sure what that means outside time) like an expanding bubble; interfering with other events, which can act like observation. These patterns of interference build histories. But like this isn't really special with respect to time, the effect should be similar to if you're coasting x, y, or z.
So like, A, B, C observers, i j are two supernova between them, A i B j C. i goes off, j goes off. Depending on the distance between them in t and xyz, like A sees i, then j. C sees j then i. B sees i and j simultaneously. There's not really something special about t in the way I've conceptualized this, though in reality I guess it's negative with respect to xyz (or vice versa). But that implies the same set up 90 degrees off doesn't actually imply anything about the order A B C see i and j, it's pretty much just what's happening in space.
So if you move from your spot you get slightly different accounts of events as they might wash over you in a slightly different order, but they're already propagating as fast as light, so you end up agreeing on the past pretty much in any case once your in the bubbles. But move faster than events can propagate and you would end up escaping their causal wake, so you'd end up in a history where things haven't happened (yet).
Different histories might be like different worlds, in a sense. You'd also be strongly displaced in space before you might start to notice anything, however.
Like if we're points the reason for an arrow of time is you can only 'see' events that have become tangent to you, after they've interfered with everything you can reach. The events you're building a history of don't emanate from you, except the events you are. But this is symmetrical. So like, even if you're travelling perpendicular to t you end up building up your own history and from your perspective you're always going to look like you're going forward.
Feel like I've smuggled in a separate time than the direction t. QM's definition of time seems different than gr's for whatever that's worth but maybe not necessary still.
We're all kinda riding tangents whatever directions we're going. We're complex and there's a lot of waves involved in us so we're mostly traveling in the same direction, riding approximately the same tangents, interfering with ourselves as our events broadcast themselves so creating a common history growing faster than we move.
Maybe things are passing by back in time all the time, into smaller spheres. But they broadcast their own events as they pass us by. So we end up experiencing them as if they're something moving forward in time from our perspective. So it ends up just looking like passing each other by.
Except cpt symmetry implies that's wrong. We'd probably see like antimatter stars orbiting matter stars or something. I guess that's where I need to think when I get stuck on this again
