Differential and Integral Equations
- Differential Integral Equations
- Volume 24, Number 7/8 (2011), 653-718.
Bounds on the growth of high Sobolev norms of solutions to nonlinear Schrödinger equations on $S^1$
We consider nonlinear Schrödinger-type equations on $S^1$. In this paper, we obtain polynomial bounds on the growth in time of high Sobolev norms of their solutions. The key is to derive an iteration bound based on a frequency decomposition of the solution, which is different than the iteration bound first used by Bourgain in . We first look at the NLS equation with nonlinearity of degree $\geq 5$. For $q=5$, Bourgain in  derives stronger bounds using different techniques. However, our approach works for higher nonlinearities, where the techniques from  don't seem to apply. Furthermore, we study non-integrable modifications of the cubic NLS, among which is the Hartree equation, with sufficiently regular convolution potential. For most of the equations obtained this way, we obtain better bounds than for the other equations, due to the fact that we can use higher modified energies, as in the work of the I-Team [18, 20].
Differential Integral Equations, Volume 24, Number 7/8 (2011), 653-718.
First available in Project Euclid: 27 December 2012
Permanent link to this document
Mathematical Reviews number (MathSciNet)
Zentralblatt MATH identifier
Primary: 35Q55: NLS-like equations (nonlinear Schrödinger) [See also 37K10]
Sohinger, Vedran. Bounds on the growth of high Sobolev norms of solutions to nonlinear Schrödinger equations on $S^1$. Differential Integral Equations 24 (2011), no. 7/8, 653--718. https://projecteuclid.org/euclid.die/1356628828