Conformal-radius convergence-rate conjecture for the Method of Fundamental Solutions

Let Omega Omega be a simply connected domain with analytic boundary, and let ρz\rho_z denote the conformal radius of zz with respect to Omega Omega. Place the MFS points equally spaced in conformal angle at conformal distance R>1R>1 around Omega Omega. Let tt be the MFS error, and let ρ>1\rho>1 be the conformal radius of the closest singularity of the analytic continuation of uu. Conformal-radius convergence-rate conjecture. There is a constant CC, depending possibly on Omega Omega, kk, RR and vv but not on NN, such that

t{CρN/2,ρ<R2,CRN,ρ>R2.t \le \begin{cases} C\rho^{-N/2},& \rho<R^2,\\ CR^{-N},& \rho>R^2.\end{cases}

Furthermore, if uu continues to an entire function, the latter estimate holds for every R>1R>1. This conjecture extends the corresponding convergence-rate result from the unit disk to general analytic domains; the case ρ=R2\rho=R^2 is deliberately excluded because numerical evidence does not determine whether an additional algebraic factor is required.

Sources & referencesView supporting material

Primary source

A. H. Barnett and T. Betcke, “Stability and convergence of the Method of Fundamental Solutions for Helmholtz problems on analytic domains”, arXiv:0708.3533 (2007).

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