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Anatomy of a strong residual sign problem on the thimbles

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Bloch, Jacques
Date of publication of this fulltext: 14 Feb 2019 10:44


Using a simple Gaussian-like Ansatz for the phase distribution of a theory with a complex action, we show how the thimble integration for the average phase factor can be plagued by a strong residual sign problem when the phase of the complex integration measure conspires with the constant phase of the integrand along the thimble. This strong sign problem prohibits the accurate computation of the ...


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