Counterterm resummation for 2PI-approximation in constant background

Understand

Explicit counterterm construction is presented in a symmetry breaking background for the 2PI effective action of the self-interacting one-component scalar field including skeleton diagrams to O(\lambda^2).

• The applied strategy is an extension of our treatment of the 2PI-Hartree approximation [G.
• Fejos, A.
• Patkos and Zs.