No going back (Image: Mike Kemp/Getty)
Nothing in the most fundamental laws of physics says that time should only move in one direction. Yet many events are irreversible – shattered eggs do not spontaneously reassemble and ice cubes do not form from pools of tepid water. A new study suggests this arrow of time is the result of quantum mechanical amnesia that erases any trace of such events.
Our sense of time is captured by the second law of thermodynamics, which says that any closed system – from particles in an isolated box to the entire universe – can only become…
