# Adaptive Aggregation-based Domain Decomposition Multigrid for Twisted Mass Fermions

@article{Alexandrou2016AdaptiveAD, title={Adaptive Aggregation-based Domain Decomposition Multigrid for Twisted Mass Fermions}, author={C. Alexandrou and S. Bacchio and J. Finkenrath and A. Frommer and K. Kahl and M. Rottmann}, journal={Physical Review D}, year={2016}, volume={94}, pages={114509} }

The Adaptive Aggregation-based Domain Decomposition Multigrid method (arXiv:1303.1377) 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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