Speeding up lattice QCD simulations with clover improved Wilson fermions

By M. Hasenbusch, K. Jansen. 2002

143 citations recorded by the source corpus.

Abstract We apply a recent proposal to speed up the hybrid Monte Carlo simulation of systems with dynamical fermions to two flavour QCD with clover-improvement. The basic idea of our proposal is to split the fermion matrix into two factors with a reduced condition number each. In the effective action, for both factors a pseudo-fermion field is introduced. For our smallest quark masses we see a speed-up of more than a factor of two compared with the standard algorithm.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/faccd290fcb547d93dc035a4f8eba9fd0c2e1ba6

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In Nuclear and High Energy Physics

Citations in the corpus

The strange quark mass and Lambda parameter of two flavor QCD (2012, methodology): “For some lattices, we therefore used a Hybrid Monte Carlo algorithm [20] with a mass preconditioned fermion determinant [21,22].”
Nonperturbative QCD Simulations with 2+1 Flavors of Improved Staggered Quarks (2009, methodology): “…integration schemes” (Sexton and Weingarten, 1992), preconditioning of the fermion determinant by multiple pseudofermion fields (Hasenbusch, 2001; Hasenbusch and Jansen, 2003), and replacing the leapfrog integration scheme with more sophisticated “Omelyan integraors” (Omelyanet al., 2002a,b,…”
Light Hadron Masses from Lattice QCD (2012, background): “Splitting off the UV modes of the spectrum by mass preconditioning (Hasenbusch, 2001; Hasenbusch and Jansen, 2003) or via domain decomposition (Luscher, 2003, 2004, 2005) and integrating IR and UV part with different time steps leads to a substantial additional speedup.”
Higher representations on the lattice: numerical simulations. SU(2) with adjoint fermions (2008, background): “Introduction Recent algorithmic progress in simulations of QCD with dynamical fermions have shown that current computing facilities can reach beyond the quenched approximation without compromising the robustness of the formulation [1, 2, 3, 4, 5, 6].”
Simulation of QCD with Nf = 2 + 1 flavors of non-perturbatively improved Wilson fermions (2014, methodology): “To this end we use Hasenbusch’s mass factorization [36] with a twisted mass [37] applied to the last term in eq.”