*2.3. The Electromagnetic Source of an Axial Vector Field*

Let us consider the spin densities of the spinor and electromagnetic fields as the sources of the axial vector field *α<sup>i</sup>* . The components of the axial currents (19) for fermions and photon fields can be obtained by substituting Dirac bispinors *ψ* = *u v* into Equation (19).

$$j\_f^i = -\{ (u^\*v + v^\*u)/c, \ (u^\*\sigma u + v^\*\sigma v) \}, \qquad j\_b^i = \frac{1}{c} \{ \mathbf{A} \cdot \mathbf{B}, \ (\mathbf{E} \times \mathbf{A} + \phi \mathbf{B}) \}. \tag{21}$$
