By applying CPT symmetry, Turok and Boyle propose that the Universe, along with an anti-universe, forms a symmetric pair. In this model, the anti-universe stretches backward in time from the Big ...

In their "mirror" hypothesis, the Universe would be accompanied by an anti-universe, evolving in the opposite direction in time, while respecting a symmetry called CPT, a principle that balances ...

Scientists who posit an "anti-universe" made up of anti-matter (existing on the edge of our own universe) got a break when a "futuristic-sounding" device that could help prove their theories was ...