ABSTRACT
In our discussion of the random phase approximation, we saw that the particles in a Coulomb system move so as to produce a decided shielding effect. They reduce the effect of slowly varying external forces applied to the system. In particular, the applied field U(R,T) produces the reduced total potential field () U eff ( R , T ) = U ( R , T ) + ∫ d R ′ e 2 | R − R ′ | ( 〈 n ( R ′ , T ) 〉 − n ) = U ( R , T ) + ∫ d R ′ e 2 | R − R ′ | × [ ± i ( 2 S + 1 ) G < ( R , T ; R ; U ) − n ] https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429493218/2723bf93-af84-4d1d-955c-798a77ad6aa2/content/eq811.tif"/>
