Why would there be motion in a zero-energy universe?

Zero energy universe was an older model of a universe from nothing universe. It involved the Heisenberg uncertainty principle. The total sum of energy is zero but not on the localized regions. The model relied upon a Cartesian metric and requires pseudo tensors to define curvature.

 

Here is a good review on it.

http://arxiv.org/pdf/gr-qc/0605063

You can have KE + PE = 0

 

PE < 0