期刊
EUROPEAN PHYSICAL JOURNAL C
卷 71, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-011-1619-0
关键词
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资金
- BMBF
- Alexander von Humboldt foundation
- Academy of Finland
Some time ago, Cuniberti et al. have proposed a novel method for analytically continuing thermal imaginary-time correlators to real time, which requires no model input and should be applicable with finite-precision data as well. Given that these assertions go against common wisdom, we report on a naive test of the method with an idealized example. We do encounter two problems, which we spell out in detail; this implies that systematic errors are difficult to quantify. On a more positive note, the method is simple to implement and allows for an empirical recipe by which a reasonable qualitative estimate for some transport coefficient may be obtained, if statistical errors of an ultraviolet-subtracted imaginary-time measurement can be reduced to roughly below the per mille level.
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