Assertion: photon's energy | /r/HasProperty | unconstrained
Facets:
value: partly
type: DEGREE
Source sentences:
text: However, since they can be off the shell, wherever the diagram contains a closed loop, the energies and momenta of the virtual particles participating in the loop will be partly unconstrained, since a change in a quantity for one particle in the loop can be balanced by an equal and opposite change in another.