Chronon

A chronon is an idea about the smallest piece of time. Scientists think time might not flow smoothly, like water. Instead, it might come in tiny, separate bits.

If time is made of chronons, each chronon would be the shortest possible amount of time. You could not split it into anything smaller. In simple models, a chronon is like a tiny time interval.

This idea helps scientists think about how time might work at the smallest scales, where quantum rules govern everything. It connects to big questions about space, time, and how the universe operates at its most basic level.

Early work

In quantum mechanics and general relativity, time is seen as a smooth flow. Some scientists think time might come in tiny pieces, especially when trying to combine these ideas into quantum gravity.

The idea of a smallest unit of time was first suggested by a scientist named Robert Lévi in 1927.