On the estimation of the Mori-Zwanzig memory integral
On the estimation of the Mori-Zwanzig memory integral
复制标题
Mori-Zwanzig 记忆积分的估计
DOI:
10.1063/1.5003467
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发表时间:
2017
影响因子:
1.3
通讯作者:
D. Venturi
中科院分区:
文献类型:
--
作者:
Yuanran Zhu;Jason M. Dominy;D. Venturi
We develop rigorous estimates and provably convergent approximations for the memory integral in the Mori-Zwanzig (MZ) formulation. The new theory is built upon rigorous mathematical foundations and is presented for both state-space and probability density function space formulations of the MZ equation. In particular, we derive errors bounds and sufficient convergence conditions for short-memory approximations, the $t$-model, and hierarchical (finite-memory) approximations. In addition, we derive computable upper bounds for the MZ memory integral, which allow us to estimate (a priori) the contribution of the MZ memory to the dynamics. Numerical examples demonstrating convergence of the proposed algorithms are presented for linear and nonlinear dynamical systems evolving from random initial states.
DOI:
10.1016/j.jcp.2018.06.038
发表时间:
2018-04
期刊:
J. Comput. Phys.
影响因子:
--
作者:
Catherine Brennan;D. Venturi
通讯作者:
Catherine Brennan;D. Venturi