I'm brushing up. One tidbid is that "coupling" has a specific non-intuitive meaning which differs from "action-reaction pair." Since a couple acts on the system, and the action need-not be always-centering, it produces a torque, but exerts no force.
The article also mentions mass-growing at a distance, I wonder if
- they really mean "with displacement, mediated by speed"
- there's some interaction under which two gluons can enter a binary, uniform rotation about one-another
The introduction to the full text identifies a subset of the theories under comparison, and hints at the techniques the theories deployed to arrive at their predictions, for example by "light-front quantized QCD" [1]
The article also mentions mass-growing at a distance, I wonder if - they really mean "with displacement, mediated by speed" - there's some interaction under which two gluons can enter a binary, uniform rotation about one-another
The introduction to the full text identifies a subset of the theories under comparison, and hints at the techniques the theories deployed to arrive at their predictions, for example by "light-front quantized QCD" [1]
[1] https://www.mdpi.com/2571-712X/5/2/15