Assertion: photon's charge | /r/CapableOf | go in time
Facets:
value: backwards
type: MANNER
Source sentences:
text: The SU(2) symmetry can model electromagnetism (in addition to isospin) because it models two types of charges, hence giving negative and positive charges without the wrong method U(1) uses (where it specifies there are only negative charges, so positive ones have to be represented by negative charges going backwards in time).