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From: Julio Di Egidio <julio@diegidio.name>
Newsgroups: sci.physics.relativity
Subject: Re: [ANN] SR/InertialFrames v2.2.1
Date: Sun, 25 May 2025 21:46:05 +0200
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On 21/05/2025 13:47, Julio Di Egidio wrote:

> The diagrams also show that, relative to any frame of reference,
> any particle moves into the future and in space at a speed that
> is *faster than measured* in that frame (i.e. in a plane of
> simultaneity) by exactly its Lorentz factor.  And this already
> and essentially is **time travel**.
> 
> In particular, the 4-velocity of light in any frame of reference

Given that the *world line* of a "particle" is the
continuos line through the *individual instances*
in (proper!) time of that particle (just for some
terminology):

An immediate consequence of the fact that light
signals actually travel at infinite speed is that
every individual particle in this Universe must
be entangled not just with some of its neighbours
(in fact, across space and time as it turns out),
but with most (transitively) of the other instances
of the same particle along its own world line,
i.e. as soon as there are any mirrors around...

Where "self-entanglement along the world-line"
seems to me a good starting point for coherence
conditions for retro-causation, aka a solution
to the Twin Paradox.

-Julio