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arXiv math/0511381math.PRmath.CO
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随机结构中小组分计数的渐近性与凝聚-碎裂模型

Asymptotics of counts of small components in random structures and models of coagulation-fragmentation

Boris L. Granovsky

摘要:

我们建立了分划集上乘法测度收敛(在有限维分布意义下)的充要条件。我们证明了这种收敛性等价于有限大小的分量的渐近独立性。乘性测度描述了随机结构的组分谱、统计力学经典模型的平衡和凝聚-破碎的随机过程。然后,我们申请舒尔的tauberian引理和一些结果,从加性数论和枚举组合,为了验证的条件,在重要的特殊情况下。我们的研究结果表明,共同的信念,相互作用的群体在平均场模型中成为独立的粒子的数量趋于无穷大,是不正确的。

英文摘要:

We establish necessary and sufficient conditions for convergence (in the sense of finite dimensional distributions) of multiplicative measures on the set of partitions. We show that this convergence is equivalent to asymptotic independence of finite sizes of components. The multiplicative measures depict component spectra of random structures, the equilibrium of classic models of statistical mechanics and stochastic processes of coagulation-fragmentation. We then apply Schur's tauberian lemma and some results from additive number theory and enumerative combinatorics, in order to verify the conditions derived in important special cases. Our results demostrate that the common belief that interacting groups in mean field models become independent as the number of particles goes to infinity, is not true in general.

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