Logarithmic bounds on Sobolev norms for time-dependent linear Schrödinger equations

Details Logarithmic bounds on Sobolev norms for time-dependent linear Schrödinger equations Logarithmic bounds on Sobolev norms for time-dependent linear Schrödinger equations

2008-05-24

arxiv.org/abs/0805.3771v2

Mathematics

Spectral Theory

To appear in Commun. PDE (2008)

Scientific paper

We prove that in 1-D the growth of Sobolev norms for time-dependent linear Schr\"odinger equations is at most logarithmic in time for any (fixed) potential which is analytic (or Gevrey). Recently it was proven in [N] that almost surely the Sobolev norms are unbounded, which indicates that the log is almost surely necessary. In [W], the author showed that the Sobolev norms remain bounded for an explicit time periodic potential. This is in the exceptional set in the sense of [N]. The present paper together with [N, W] give a rather complete picture of time dependent linear Schr\"odinger equations on the circle.

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