Abstract
Let an external current, whose support is confined to the space-like slab |x 0| < T in two-dimensional spacetime, build up a localized charge density which vanishes for times |x 0| > T. We show that the zero mass Dirac quantum field reacts to this current by a c-number shift of the fermion number, i.e. Q out=Q in+ΔQ, with \(\Delta Q{\text{ = }}\smallint _{{\text{ - }}\infty }^\infty {\text{d}}x^0 \smallint _{{\text{ - }}\infty }^{x^0 } {\text{d}}\xi q(\xi )/\pi \), where q(x 0) denotes the total external charge. For the shift of the axial charge we obtain an extension of existing results.
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