Comparison between a diagrammatic theory for the BCS-BEC crossover and   Quantum Monte Carlo results
  Predictions for the chemical potential and the excitation gap recently obtained by our diagrammatic theory for the BCS-BEC crossover in the superfluid phase are compared with novel Quantum Monte Carlo results at zero temperature now available in the literature. A remarkable agreement is found between the results obtained by the two approaches 
P. Pieri, L. Pisani, G.C. Strinati