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Application of the path optimization method to the sign problem in an effective model of QCD with a repulsive vector-type interaction

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arxiv 1903.03679 v2 pith:QO27EUAD submitted 2019-03-02 hep-lat hep-phhep-th

classification hep-lathep-phhep-th
keywords modelproblemsignvector-typeeffectiveinteractionmethodoptimization
verification ladder T0 review T1 audit T2 compute T3 formal
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The path optimization method is applied to a QCD effective model with the Polyakov loop and the repulsive vector-type interaction at finite temperature and density to circumvent the model sign problem. We show how the path optimization method can increase the average phase factor and control the model sign problem. This is the first study which correctly treats the repulsive vector-type interaction in the QCD effective model with the Polyakov-loop via the Markov-chain Monte-Carlo approach. It is shown that the complexification of the temporal component of the gluon field and also the vector-type auxiliary field are necessary to evade the model sign problem within the standard path-integral formulation.

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  1. Path optimization method for the sign problem caused by fermion determinant

    hep-lat 2025-02 conditional novelty 5.0 of 10

    Path optimization with machine learning reproduces analytic results in the 1D lattice Thirring model, and dropping the Jacobian from the learning step still works.

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