Renormalisation in Open Quantum Field theory II: Yukawa theory and PV reduction

Understand

We compute Passarino-Veltman (PV) reduction for tensor loop integrals, that appear in open field theories.

• We apply these results to open-Yukawa theory and compute the self-energy correction of the fields.
• We found that non-local divergences show up in the one loop correction to the fermionic self-energy.
• These non-local divergences do not disappear even if the tree level theory is chosen to satisfy the trace preserving condition of the density matrix.