Consistent Fluctuation of Order parameter(CFOP) Treat the fluctuation of gap as an external field as external EM field H=∑ t T 2(p+qp)yp ptg g pg External field dp=(△q,△2,Aa)2 External field vertex 2(p+qp=(01, 02, 1"(p+qp) Perturbed current 5(u,q)=(a,q),(a,q Q1(c,q)Q12 △1( Q21(a,q)Q22(,q)Q23 △2(,q) Q31(w, q)Q32(w, q)Q33(w, q)+mhH (A,( Response function Qn(-7q)=-∑(()P+q1P)p+4(7)亚 p+q(T(pp+q)亚p( Kulik, etc, JLTP, 43, 591(1981)Consistent Fluctuation of Order parameter (CFOP) Treat the fluctuation of gap as an external field as external EM field External field External field vertex Perturbed current Response function Kulik,etc, JLTP, 43, 591(1981)