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Description
Rough gauge fields are an obstacle in large-scale dynamical fermion simulations with Wilson quarks. When the pion mass is lowered and the gap of the lattice Dirac operator shrinks, algorithmic instabilities and precision issues hamper the stability of the configurations generation and affect the estimate of observables. Ways to overcome these problems are described in this talk for the case of the O(a)-improved Wilson formulation of lattice QCD. The effectiveness of the proposed stabilizing and precision-control measures is then verified through extensive simulations of 2+1-flavour QCD.
