# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

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

Jul 27, 2016, 10:00 AM
20m
Building 67 Room 1007 (Highfield Campus, University of Southampton)

### Building 67 Room 1007

#### Highfield Campus, University of Southampton

Talk Algorithms and Machines

### Speaker

Mr Simone Bacchio (University of Cyprus - University of Wuppertal)

### Description

We extend the Adaptive Aggregation Based Domain Decomposition Multigrid (DD-$\alpha$AMG) algorithm to $N_f=2$ twisted mass fermions. We show numerical results for an $N_f=2$ ensemble of twisted fermions with a clover term simulated at the physical value of the pion mass. We fine-tuned the parameters to achieve a speedup comparable to the one obtained for clover fermions. We also present a complete analysis of the aggregation parameters that provides a novel insight on the multigrid methods for lattice QCD independently of the fermion discretization.

### Primary authors

Dr Jacob Finkenrath (The Cyprus Institute) Mr Simone Bacchio (University of Cyprus - University of Wuppertal)

### Co-authors

Prof. Andreas Frommer (University of Wuppertal) Prof. Constantia Alexandrou (University of Cyprus - The Cyprus institute) Dr Karsten Kahl (University of Wuppertal) Dr Matthias Rottmann (University of Wuppertal)

 Slides