What is "antiuniverse"

Usage examples of "antiuniverse".

Within this region, space and time recoupled and contracted inward with the imploding core to simulate for an instant the bizarre, inverted conditions of an antiuniverse, and in that instant a large portion of the tweedles liberated in the process transformed into antitweedles which, under the prevailing high-energy conditions, combined preferentially into antiquarks and antileptons rather than radiation.

The way to obtain antimatter, they therefore reasoned, would be to make a small part of the universe look like an antiuniverse so that tweedlespace could be “fooled” into projecting antitweedles instead of tweedles into it.