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The Cauchy problem for these equations (at least for SNL and KdVG)
is fairly well understood in $\mathbb{R}^n$ (see [C], [KPV2] and their bibliography). It can be be studied in the following way. The equation is of the type: $\partial_t u=Lu+f_0(u)$ where $L$ is a linear anti-self-adjoint operator in a Hilbert space $H$, typically $L^2$ or a Sobolev space $H^S$, and generates a unitary group with one parameter $U(t)=\exp(tL)$ in $H$. The Cauchy problem for equation (1.6) with initial data
$u(t=0) = \varphi\in H$ is then equivalent to the integral equation: ...
where the notation $*_R$ denotes the time-delayed convolution (delayed referring to the fact that