Controlling the sign problem in finite-density quantum field theory
Controlling the sign problem in finite-density quantum field theory
复制标题
控制有限密度量子场论中的符号问题
DOI:
10.1140/epjc/s10052-017-5039-7
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Garron N
中科院分区:
文献类型:
--
作者:
Garron N
Quantum field theories at finite matter densities generically possess a partition function that is exponentially suppressed with the volume compared to that of the phase quenched analog. The smallness arises from an almost uniform distribution for the phase of the fermion determinant. Large cancellations upon integration is the origin of a poor signal to noise ratio. We study three alternatives for this integration: the Gaussian approximation, the “telegraphic” approximation, and a novel expansion in terms of theory-dependent moments and universal coefficients. We have tested the methods for QCD at finite densities of heavy quarks. We find that for two of the approximations the results are extremely close—if not identical—to the full answer in the strong sign-problem regime.
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影响因子:
5
作者:
K. Langfeld;B. Lucini
通讯作者:
B. Lucini
DOI:
10.22323/1.214.0016
发表时间:
2014
期刊:
arXiv: High Energy Physics - Lattice
影响因子:
--
作者:
D. Sexty
通讯作者:
D. Sexty
DOI:
10.1140/epjc/s10052-016-4412-2
发表时间:
2016
期刊:
The European Physical Journal C
影响因子:
--
作者:
Garron N
通讯作者:
Garron N
影响因子:
5
作者:
L. Levkova
通讯作者:
L. Levkova
影响因子:
5
作者:
K. Langfeld;J. Pawlowski
通讯作者:
J. Pawlowski