Hi guys,
If I use the definition of the scalar complex field as the combination of two scalar real fields, I can get
\phi (x) = \int \frac{d^3 p}{(2\pi )^3} \frac{1}{\sqrt{2p_0}} [ \hat a _{\vec{p}} e^{-ip.x} + \hat b _{\vec{p}}^{\dagger } e^{ip.x}]
which I can rewrite in terms of...