DDalphaAMG for Twisted Mass Fermions

TL;DR

This paper extends the DDalphaAMG multigrid solver to twisted mass fermions, demonstrating its performance and parameter tuning benefits in lattice QCD simulations at the physical point.

Contribution

The paper introduces an extension of the DDalphaAMG multigrid method for twisted mass fermions and evaluates its effectiveness in HMC simulations.

Findings

Improved solver performance at the physical point.

Effective parameter tuning for twisted mass fermions.

Successful integration with tmLQCD software.

Abstract

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 function of tuning the parameters that enter the twisted mass version of the DDalphaAMG library (https://github.com/sbacchio/DDalphaAMG). Moreover, we linked the DDalphaAMG library to the tmLQCD software package and give details on the performance of the multigrid solver during HMC simulations at the physical point.