Comment on "High Precision Measurement of the Thermal Exponent for the three-dimensional XY Universality Class"

Details Comment on "High Precision Measurement of the Thermal Exponent for the three-dimensional XY Universality Class" Comment on "High Precision Measurement of the Thermal Exponent for the three-dimensional XY Universality Class"

2005-07-22

arxiv.org/abs/cond-mat/0507541v1

Physics

Condensed Matter

Statistical Mechanics

2 pages, 1 figure

Scientific paper

A recent paper [Burovski et al., cond-mat/0507352] reports on a new, high-accuracy simulation of the classical phi^4 model (in the three-dimensional XY universality class). The authors claim that a careful scaling analysis of their data gives nu = 0.6711(1) for the thermal critical exponent. If correct, this would neatly resolve the discrepancy between numerical simulations and experiments on 4He. There is reason, however, to doubt the accuracy of the result. A re-analysis of the data yields a significantly higher value of nu, one that is consistent with other Monte Carlo studies.

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