On the particle density of mass zero bosons and energy density of mass zero fermions

Abstract It is shown that even nonlocal generalizations of the usual expressions forthe particle probability density of mass zero, spin zero (one) bosons;the energy density of mass zero spin one half fermions; can become negative, indicating that the method of obtaining positive definite expressions...
Ausführliche Beschreibung

Abstract It is shown that even nonlocal generalizations of the usual expressions forthe particle probability density of mass zero, spin zero (one) bosons;the energy density of mass zero spin one half fermions; can become negative, indicating that the method of obtaining positive definite expressions for massive $ particles^{2,4} $ for the above quantities does not work here. Ausführliche Beschreibung