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Lattice QCD with open boundary conditions and twisted-mass reweighting

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arxiv 1206.2809 v1 pith:ANOBNO5O submitted 2012-06-13 hep-lat

Martin Lüscher , Stefan Schaefer This is my paper · ORCID
classification hep-lat
keywords latticeboundaryconditionsopenreweightingtwisted-massphysicalsimulations
verification ladder T0 review T1 audit T2 compute T3 formal
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Lattice QCD simulations at small lattice spacings and quark masses close to their physical values are technically challenging. In particular, the simulations can get trapped in the topological charge sectors of field space or may run into instabilities triggered by accidental near-zero modes of the lattice Dirac operator. As already noted in ref. [1], the first problem is bypassed if open boundary conditions are imposed in the time direction, while the second can potentially be overcome through twisted-mass determinant reweighting [2]. In this paper, we show that twisted-mass reweighting works out as expected in QCD with open boundary conditions and 2+1 flavours of O(a) improved Wilson quarks. Further algorithmic improvements are tested as well and a few physical quantities are computed for illustration.

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