The Boltzmann–Grad limit of a hard sphere system: analysis of the correlation error
The Boltzmann–Grad limit of a hard sphere system: analysis of the correlation error
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硬球系统的玻尔兹曼梯度极限:相关误差分析
DOI:
10.1007/s00222-016-0682-4
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发表时间:
2017
影响因子:
3.1
通讯作者:
S. Simonella
中科院分区:
文献类型:
--
作者:
M. Pulvirenti;S. Simonella
We present a quantitative analysis of the Boltzmann–Grad (low-density) limit of a hard sphere system. We introduce and study a set of functions, thecorrelation errors, measuring the deviations in time from the statistical independence of particles (propagation of chaos). In the context of the BBGKY hierarchy, a correlation error of orderkmeasures the event wherekparticles are connected by a chain of interactions preventing the factorization. We show that, provided, such an error flows to zero with the average density, for short times, as, for some positive. This provides an information on thesize of chaos, namelyjdifferent particles behave as dictated by the Boltzmann equation even whenjdiverges as a negative power of. The result requires a rearrangement of Lanford perturbative series into a cumulant type expansion, and an analysis of many-recollision events.
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DOI:
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