Calculating the chiral condensate diagrammatically at strong coupling

Understand

We calculate the chiral condensate of QCD at infinite coupling as a function of the number of fundamental fermion flavours using a lattice diagrammatic approach inspired by recent work of Tomboulis, and other work from the 80's.

• We outline the approach where the diagrams are formed by combining a truncated number of sub-diagram types in all possible ways.
• Our results show evidence of convergence and agreement with simulation results at small Nf.
• However, contrary to recent simulation results, we do not observe a transition at a critical value of Nf.