7.17
Problems
217
7.16 Verify equation (7.143).
(a) Check that the anticommutation relations (7.44) and (7.45) are left
invariant under (7.151).
¯ ˆ
(b) Check that the Dirac electromagnetic current density ψ(x)γ
μ ψ ˆ (x) is
odd under C when normally ordered. [Hint : the normally ordered
ˆ
current can be written as
1 [ψ
¯ (x), γ
μ ψ ˆ (x)].]
2
Problems
217
7.16 Verify equation (7.143).
(a) Check that the anticommutation relations (7.44) and (7.45) are left
invariant under (7.151).
¯ ˆ
(b) Check that the Dirac electromagnetic current density ψ(x)γ
μ ψ ˆ (x) is
odd under C when normally ordered. [Hint : the normally ordered
ˆ
current can be written as
1 [ψ
¯ (x), γ
μ ψ ˆ (x)].]
2