Originally Posted By: Bill S.
This must mean that the laws of physics, as we know them, are reversed in the reality inhabited by the tachyon.


I worded that badly. What I meant was: "This must mean that the laws of physics, as we know them, would appear to us to be reversed in the reality inhabited by the tachyon."

A little further on I reach the conclusion that: "It becomes increasingly difficult to imagine life, or any ongoing reactions, in a world in which the laws of physics are reversed."

the point of having the diagrams invertable is to argue that the denizens of either "half" of the universe would see time etc on their own side as normal, and on the other side as reversed.

There never was nothing.