Abstract
AbstractFor both the cubic Nonlinear Schrödinger Equation (NLS) as well as the modified Korteweg-de Vries (mKdV) equation in one space dimension we consider the set $\mathbf {M}_{N}$ M N of pure $N$ N -soliton states, and their associated multisoliton solutions. We prove that (i) the set $\mathbf {M}_{N}$ M N is a uniformly smooth manifold, and (ii) the $\mathbf {M}_{N}$ M N states are uniformly stable in $H^{s}$ H s , for each $s>-\frac{1}{2}$ s > − 1 2 .One main tool in our analysis is an iterated Bäcklund transform, which allows us to nonlinearly add a multisoliton to an existing soliton free state (the soliton addition map) or alternatively to remove a multisoliton from a multisoliton state (the soliton removal map). The properties and the regularity of these maps are extensively studied.
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