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

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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≤{Cρ−N/2,ρ<R2,CR−N,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.

References

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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