Simulating the Schroedinger functional with two pseudo-fermions
M. Della Morte, F. Knechtli, J. Rolf, R. Sommer, I. Wetzorke, U. Wolff, (ALPHA Collaboration)
TL;DR
This paper presents simulations of two-flavor Wilson fermions using the Schrödinger functional, demonstrating a more efficient Hybrid Monte Carlo algorithm with two pseudo-fermions that halves computational costs.
Contribution
It introduces an improved HMC algorithm with two pseudo-fermions for Schrödinger functional simulations, achieving significant efficiency gains.
Findings
Two pseudo-fermions double the step-size in HMC.
The algorithm reduces CPU cost by a factor of two.
Numerical precision and reversibility are maintained.
Abstract
We report on simulations with two flavors of O(a) improved degenerate Wilson fermions with Schroedinger functional boundary conditions. The algorithm which is used is Hybrid Monte Carlo with two pseudo-fermion fields as proposed by M. Hasenbusch. We investigate the numerical precision and sensitivity to reversibility violations of this algorithm. A gain of a factor two in CPU cost is reached compared with one pseudo-fermion field due to the larger possible step-size.
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