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Path optimization method for the sign problem caused by fermion determinant

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arxiv 2502.02804 v2 pith:V4SXKMW3 submitted 2025-02-05 hep-lat hep-ph

Path optimization method for the sign problem caused by fermion determinant

classification hep-lat hep-ph
keywords methodoptimizationpathproblemsignapproximationcauseddeterminant
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The path optimization method with machine learning is applied to the one-dimensional massive lattice Thirring model, which has the sign problem caused by the fermion determinant. This study aims to investigate how the path optimization method works for the sign problem. We show that the path optimization method successfully reduces statistical errors and reproduces the analytic results. We also examine an approximation of the Jacobian calculation in the learning process and show that it gives consistent results with those without an approximation.

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  1. Path optimization method for the sign problem: Insights from random matrix models

    hep-lat 2026-07 conditional novelty 5.0

    Path optimization improves the average phase factor in the Stephanov model at high chemical potential but not at low chemical potential or in the chiral random matrix model, pointing to the global sign problem as the ...