At the quantum level, the past and the future are indiscernible. That could have profound effects on the world we can see.

A broken glass shatters and does not reassemble itself. Entropy guides what we call the arrow of time. But in the quantum ...

The origin of the arrows of time — sometimes called the master arrow of time — must thus be found in the history of our Universe, that is, in cosmology. This was already clear to Boltzmann.

can describe physical processes only in so far as they are reversible in time 1. This means that a film taken of a classical process should be reversible, in the sense that, if put into a ...