A remark on normal forms and the "upside-down" I-method for periodic NLS: growth of higher Sobolev norms

Details A remark on normal forms and the "upside-down" I-method for periodic NLS: growth of higher Sobolev norms A remark on normal forms and the "upside-down" I-method for periodic NLS: growth of higher Sobolev norms

2010-10-12

arxiv.org/abs/1010.2501v2

Mathematics

Analysis of PDEs

24 pages. Small modification in Section 1, to appear in J. Anal. Math

Scientific paper

We study growth of higher Sobolev norms of solutions to the one-dimensional periodic nonlinear Schrodinger equation (NLS). By a combination of the normal form reduction and the upside-down I-method, we establish \|u(t)\|_{H^s} \lesssim (1+|t|)^{\alpha (s-1)+} with \alpha = 1 for a general power nonlinearity. In the quintic case, we obtain the above estimate with \alpha = 1/2 via the space-time estimate due to Bourgain [4], [5]. In the cubic case, we concretely compute the terms arising in the first few steps of the normal form reduction and prove the above estimate with \alpha = 4/9. These results improve the previously known results (except for the quintic case.) In Appendix, we also show how Bourgain's idea in [4] on the normal form reduction for the quintic nonlinearity can be applied to other powers.

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