We construct an efficient emulator for two-body scattering observables using the general (complex) Kohn variational principle and trial wave functions derived from eigenvector continuation. The emulator simultaneously evaluates an array of Kohn variational principles associated with different boundary conditions, which allows for the detection and removal of spurious singularities known as Kohn anomalies. When applied to the K-matrix only, our emulator resembles the one constructed by Furnstahl et al. (2020) [29] although with reduced numerical noise. After a few applications to real potentials, we emulate differential cross sections for ⁴⁰Ca$(n,n)$ scattering based on a realistic optical potential and quantify the model uncertainties using Bayesian methods. These calculations serve as a proof of principle for future studies aimed at improving optical models.

我们使用一般（复杂）Kohn 变分原理和从特征向量连续导出的试验波函数为二体散射可观测量构建了一个有效的模拟器。模拟器同时评估与不同边界条件相关的一系列 Kohn 变分原理，这允许检测和去除称为 Kohn 异常的虚假奇异点。当仅应用于K矩阵时，我们的仿真器类似于 Furnstahl 等人构建的仿真器。(2020) [29] 虽然减少了数值噪声。在对实际电位进行了几次应用后，我们模拟了⁴⁰ Ca 的微分横截面$(n,n)$基于真实光学势的散射，并使用贝叶斯方法量化模型的不确定性。这些计算可作为未来旨在改进光学模型的研究的原理证明。