Abstract
The Adaptive Aggregation-based Domain Decomposition Multigrid method
(<a href="/abs/1303.1377">arXiv:1303.1377</a>) is extended for two degenerate flavors of twisted mass
fermions. By fine-tuning the parameters we achieve a speed-up of the order of
hundred times compared to the conjugate gradient algorithm for the physical
value of the pion mass. A thorough analysis of the aggregation parameters is
presented, which provides a novel insight into multigrid methods for lattice
QCD independently of the fermion discretization.
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