Über kausales Verhalten nichtlokaler Größen und Teilchenstruktur in der Feldtheorie.

In a preceding paper a new expression ~ for the charge density of the Klein-Gordon field was constructed which is positive definite if confined to positive frequency solutions only. This is not the case for the usual charge density. The present paper deals with some properties of ~. We propose a generalized definition for macrocausality which can be applied to nonlocal expressions too, yielding a causal behaviour in the case of ~. [ABSTRACT FROM AUTHOR]