出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present simulation results for the 2-flavour Schwingermodelwith dynamicalGinsparg-Wilson
fermions. Our Dirac operator is constructed by inserting an approximately chiral hypercube operator
into the overlap formula, which yields the overlap hypercube operator. Due to the similarity
with the hypercubic kernel, a low polynomial of this kernel can be used as a numerically cheap
way to evaluate the fermionic part of the Hybrid Monte Carlo force. We verify algorithmic requirements
like area conservation and reversibility, and we discuss the viability of this approach in
view of the acceptance rate. Next we confirm a high level of locality for this formulation. Finally
we evaluate the chiral condensate at light fermion masses, based on the density of low lying Dirac
eigenvalues in different topological sectors. The results represent one of the first measurements
with dynamical overlap fermions, and they agree very well with analytic predictions.
