  A `covariant' field that transforms like a relativistic field operator is
required to be a linear combination of `canonical' fields that transform like
annihilation and creation operators and with invariant coefficients. The
Invariant Coefficient Hypothesis contends that this familiar construction by
itself yields useful results. Thus, just the transformation properties are
considered here, not the specific properties of annihilation or creation
operators. The results include Weyl wave equations for some massless fields
and, for other fields, Weyl-like noncovariant wave equations that are allowed
here because no assumptions are made to exclude them. The hypothesis produces
wave equations for translation-matrix-invariant fields while
translation-matrix-dependent coefficient functions have currents that are the
vector potentials of the coefficient functions of those
translation-matrix-invariant fields. The statement is proven by showing that
Maxwell equations are satisfied, though in keeping with the hypothesis they are
not assumed to hold. The underlying mechanism is the same for the massless
class here as it is for the massive class in a previous paper, suggesting that
spin 1/2 particles may have a universal electromagnetic-type charge whether
they are massive or massless.
  Keywords: Relativistic quantum fields; neutrino; Poincare transformations
