Physicists use mathematical assumptions in many situations that forbid time from moving backwards – but that isn’t necessarily a reflection of quantum reality. By Karmela Padavic-Callaghan.

Time, as we understand it, moves from the past to the future irreversibly. But now, an international trio of theoretical physicists is suggesting that there’s more than one future. Two parallel ...

In this model, the anti-universe stretches backward in time from the Big Bang, mirroring the properties of our Universe with reversed spatial configurations and dominated by antimatter.