Scaling limit of a directed polymer among a Poisson field of independent walks
Scaling limit of a directed polymer among a Poisson field of independent walks
复制标题
独立游走泊松场中定向聚合物的缩放极限
DOI:
10.1016/j.jfa.2021.109066
复制
发表时间:
2021
影响因子:
1.7
通讯作者:
Xu, Lihu
中科院分区:
文献类型:
--
作者:
Shen, Hao;Song, Jian;Sun, Rongfeng;Xu, Lihu
We consider a directed polymer model in dimension 1+ 1, where the disorder is given by the occupation field of a Poisson system of independent random walks on Z. In a suitable continuum and weak disorder limit, we show that the family of quenched partition functions of the directed polymer converges to the Stratonovich solution of a multiplicative stochastic heat equation (SHE) with a Gaussian noise, whose space-time covariance is given by the heat kernel. In contrast to the case with space-time white noise where the solution of the SHE admits a Wiener-Itô chaos expansion, we establish an L 1-convergent chaos expansions of iterated integrals generated by Picard iterations. Using this expansion and its discrete counterpart for the polymer partition functions, the convergence of the terms in the expansion is proved via functional analytic arguments and heat kernel estimates. The Poisson random walk system is amenable to careful moment analysis, which is an important input to our arguments.
登录
查看更多内容
影响因子:
3
作者:
Ivan Corwin;Hao Shen
通讯作者:
Ivan Corwin;Hao Shen
影响因子:
2.6
作者:
F. Caravenna;Rongfeng Sun;Nikos Zygouras
通讯作者:
F. Caravenna;Rongfeng Sun;Nikos Zygouras
影响因子:
1.8
作者:
F. Caravenna;Rongfeng Sun;Nikos Zygouras
通讯作者:
Nikos Zygouras
影响因子:
4
作者:
D. Nualart
通讯作者:
D. Nualart
DOI:
10.1214/17-aihp829
发表时间:
2016
期刊:
arXiv: Probability
影响因子:
--
作者:
Ivan Corwin;Hao Shen;Li
通讯作者:
Li