arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.06151math.NAcs.NAgr-qc
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经验插值方法和引力波替代的稳定性和精度

On the stability and accuracy of the Empirical Interpolation Method and Gravitational Wave Surrogates

Manuel Tiglio, Aarón Villanueva

摘要:

缩减基和经验插值方法(EIM)的结合在许多学科中产生了杰出的结果。特别是,在引力波(GW)科学,这些结果的范围从建立非侵入性的代理模型的GW快速参数估计添加使用降阶求积。这些替代物具有本质上与爱因斯坦方程的超级计算机模拟无法区分或非常接近的显着特征,但可以在标准笔记本电脑上以每多极模式毫秒的数量级进行评估。在这篇文章中,我们澄清了一个常见的误解EIM最初介绍和在GW科学的实践中使用。也就是说,我们证明了EIM在每次迭代选择的插值节点,使相关的Vandermonde型矩阵尽可能可逆,不一定优化其条件或精度的插值有时认为。事实上,我们引入了两个新的变化的EIM,嵌套以及,这方面的条件和勒贝格常数,分别进行优化,并通过数值实验与原来的EIM使用GWs进行比较。我们的分析和数值结果表明,解决原来的EIM,空调,和勒贝格常数之间的微妙关系,与严格的逼近论和相关领域的积极研究相一致。

英文摘要:

The combination of the Reduced Basis and the Empirical Interpolation Method (EIM) approaches have produced outstanding results in many disciplines. In particular, in gravitational wave (GW) science these results range from building non-intrusive surrogate models for GWs to fast parameter estimation adding the use of Reduced Order Quadratures. These surrogates have the salient feature of being essentially indistinguishable from or very close to supercomputer simulations of the Einstein equations, but can be evaluated in the order of a milisecond per multipole mode on a standard laptop. In this article we clarify a common misperception of the EIM as originally introduced and used in practice in GW science. Namely, we prove that the EIM at each iteration chooses the interpolation nodes so as to make the related Vandermonde-type matrix as invertible as possible; not necessarily optimizing its conditioning or accuracy of the interpolant as is sometimes thought. In fact, we introduce two new variations of the EIM, nested as well, which do optimize with respect to conditioning and the Lebesgue constant, respectively, and compare them through numerical experiments with the original EIM using GWs. Our analyses and numerical results suggest a subtle relationship between solving for the original EIM, conditioning, and the Lebesgue constant, in consonance with active research in rigorous approximation theory and related fields.

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