Scalar polarization operator in a superfluid medium
A QCD-inspired effective theory of fermions is considered to study superfluidity. We calculate the quark propagator in a theory with fermion-fermion condensate at finite density. In this theory color degrees of freedom are absent and the quark-quark interaction is modeled through a Yukawa interaction term. Since the diquark condensate is neutral, the system is a superfluid. To study the response of this superfluid to the scalar field propagation, we find the scalar polarization operator of the system.
Barman, Sajib Kumar, "Scalar polarization operator in a superfluid medium" (2013). ETD Collection for University of Texas, El Paso. AAI1545149.