On the Boundedness in $H^{1/4}$ of the Maximal Square Function Associated with the Schroedinger Equation

Details On the Boundedness in $H^{1/4}$ of the Maximal Square Function Associated with the Schroedinger Equation On the Boundedness in $H^{1/4}$ of the Maximal Square Function Associated with the Schroedinger Equation

2003-07-09

arxiv.org/abs/math/0307109v1

Mathematics

Classical Analysis and ODEs

20 pages, 3 figures

Scientific paper

A long standing conjecture for the linear Schroedinger equation states that 1/4 of derivative in $L^2$, in the sense of Sobolev spaces, suffices in any dimension for the solution to that equation to converge almost everywhere to the initial datum as the time goes to 0. This is only known to be true in dimension 1 by work of Carleson. In this paper we show that the conjecture is true on spherical averages. To be more precise, we prove the $L^2$ boundedness of the associated maximal square function on the Sobolev class $H^{1/4}(R^n)$ in any dimension n.

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