Stability of nonlinear recovery from scattering and modified scattering maps

We prove stability estimates for the recovery of the nonlinearity from the scattering or modified scattering map for one-dimensional nonlinear Schrödinger equations. We consider nonlinearities of the form $a(x)\mathrm{\mid }u{\mathrm{\mid }}^{p}u$ for $p\in [2,4]$ and $[1+a(x)]\mathrm{\mid }u{\mathrm{\mid }}^{2}u$, where $a$ is a localized function. In the first case, we show that for $p\in (2,4]$ we may obtain a Hölder-type stability estimate for recovery via the scattering map, while for $p=2$ we obtain a logarithmic stability estimate. In the second case, we show a logarithmic stability estimate for recovery via the modified scattering map.