It's Fitzpatrick's RPR - - Relative Phase Relationships: - - Phase
Coherence is the reason for the binding attractive force in ALL the 4
fundamental forces, Proof of this is in the following:

Our space is built up by the average amount elements are out of phase
with each other.

Repulsive forces are generated between elements that are out of phase
more than this average.

While elements more in phase, than this average (phase coherence),
produce attractive forces.

http://www.amperefitz.com/phase.coherence.htm

Click link above -- Science!