Summary
Can a Fourier solver efficiently handle cross-sections that vary along propagation?
Uses a higher-order perturbative expansion and adaptive longitudinal discretization.
Reduces the cost of modelling varying profiles relative to the paper’s conventional slicing comparisons.
Related modelling approaches
Relation labels come from the method guide and are editorial. Unlabelled links are conceptual connections or comparison methods; the paper does not necessarily implement them.
Commentary
Longitudinal error control does not remove the need to converge the transverse Fourier basis.
Addresses geometric discretization, whereas eigendecomposition-free work targets the layer algebra.
Interpretation and connections in this note, separate from the authors’ reported findings.