123 citations · 451 across the 36 of their papers we have counts for
26 papers · 1 filter
MG-MLMC++ as a Variance Reduction Method for Estimating the Trace of a Matrix Inverse
Andreas Frommer, Mostafa Nasr Khalil
Hutchinson's method estimates the trace of a matrix function stochastically using samples , where the components of the random vectors obey an isotropic probab…
Deflated Multigrid Multilevel Monte Carlo
Andreas Frommer, Gustavo Ramirez-Hidalgo
In lattice QCD, the trace of the inverse of the discretized Dirac operator appears in the disconnected fermion loop contribution to an observable. As simulation methods get more an…
A multigrid accelerated eigensolver for the Hermitian Wilson-Dirac operator in lattice QCD
Andreas Frommer, Karsten Kahl, Francesco Knechtli +3
Eigenvalues of the Hermitian Wilson-Dirac operator are of special interest in several lattice QCD simulations, e.g., for noise reduction when evaluating all-to-all propagators. In…
Adaptive Aggregation-based Domain Decomposition Multigrid for Twisted Mass Fermions
Constantia Alexandrou, Simone Bacchio, Jacob Finkenrath +3
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 parameter…
DDalphaAMG for Twisted Mass Fermions
Simone Bacchio, Costantia Alexandrou, Jacob Finkenrath +3
We present the Adaptive Aggregation-based Domain Decomposition Multigrid method extended to the twisted mass fermion discretization action. We show comparisons of results as a func…
(Approximate) Low-Mode Averaging with a new Multigrid Eigensolver
Gunnar Bali, Sara Collins, Andreas Frommer +5
We present a multigrid based eigensolver for computing low-modes of the Hermitian Wilson Dirac operator. For the non-Hermitian case multigrid methods have already replaced conventi…