## Differential and Integral Equations

### Local well-posedness of the NLS equation with third order dispersion in negative Sobolev spaces

#### Abstract

We show the time local well-posedness in $H^s$ of the reduced NLS equation with third order dispersion (r3NLS) on $\mathbf{T}$ for $s > -1/6$. Our proof is based on the nonlinear smoothing effect, which is similar to that for mKdV. However, when (r3NLS) is considered in Sobolev spaces of negative indices, the unconditional uniqueness of solutions, that is, the uniqueness of solutions without auxiliary spaces breaks down in marked contrast to mKdV.

#### Article information

Source
Differential Integral Equations Volume 31, Number 1/2 (2018), 111-132.

Dates
First available in Project Euclid: 26 October 2017