I'm writing a Science Fiction tale, and I am trying to get something together on the FTL fizix involved in the story.

By chance I came across this [paper][1], _A GENERAL LOCAL CAUSALITY PRINCIPLE OF SPACE-TIME A PREPRINT_- by Colombian astrophysicist B. Calvo-Mozo.
From what I understand ;), he refers to various velocity regimes c1, c2, c3, …, where c1 is sub-luminal and c2, etc., are super-luminal/FTL. The first FTL, c2, is 5.2E26 c; which is--I'm sure you will agree--truckin'.

I'd like to use this in my story, but don't understand the transition from one regime to another, ie, c1 to c2, etc. He mentions a _discrete_ something, whatever that means. Could anyone explain in plain English, please?

  [1]: https://www.researchgate.net/project/subluminal-to-superluminal-transitions-and-vice-versa