Convergence of Random Batch Method for interacting particles with disparate species and weights
Convergence of Random Batch Method for interacting particles with disparate species and weights
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具有不同种类和重量的相互作用粒子的随机批量方法的收敛性
DOI:
10.1137/20m1327641
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发表时间:
2020-03
期刊:
影响因子:
--
通讯作者:
Jian-Guo Liu
中科院分区:
文献类型:
--
作者:
Shi Jin;Lei Li;Jian-Guo Liu
We consider in this work the convergence of Random Batch Method proposed in our previous work [Jin et al., J. Comput. Phys., 400(1), 2020] for interacting particles to the case of disparate species and weights. We show that the strong error is of $O(\sqrt{\tau})$ while the weak error is of $O(\tau)$ where $\tau$ is the time step between two random divisions of batches. Both types of convergence are uniform in $N$, the number of particles. The proof of strong convergence follows closely the proof in [Jin et al., J. Comput. Phys., 400(1), 2020] for indistinguishable particles, but there are still some differences: since there is no exchangeability now, we have to use a certain weighted average of the errors; some refined auxiliary lemmas have to be proved compared with our previous work. To show that the weak convergence of empirical measure is uniform in $N$, certain sharp estimates for the derivatives of the backward equations have been used. The weak convergence analysis is also illustrating for the convergence of Random Batch Method for $N$-body Liouville equations.
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DOI:
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arXiv: Numerical Analysis
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期刊:
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