**Rotation**

As I mused a few years ago in another document, rotation seems inevitable. Not rotating is just a unique case of rotation where the angular momentum is zero. Why would that be favored? It’s unlikely because with zero rotation, the axis of rotation is undefined. That means there are infinite axes along which rotation could happen. Infinite opportunities for instabilities.

Working off the concept that momentum is fundamental to our world, the simplest momentum is angular momentum. If our universe (multiverse) rotates in some way, it explains entropy and the single observed direction of time. Momentum is in only one rotational direction. Reversing time would mean reversing the angular momentum.

The universe is a 3D surface in 4 dimensions. The rotation must be a higher dimensional phenomenon. Observing it from a 3D point of view might be difficult. However, the angular momentum would have to appear as energy somewhere.

There could be counter rotation that made the total momentum zero, but it is unlikely to be without wobbles that created local net momentums.