, Volume 77, Issue 1-2, pp 1-16

A remark on Schrödinger operators

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We study the almost everythere convergence to the initial dataf(x)=u(x, 0) of the solutionu(x, t) of the two-dimensional linear Schrödinger equation Δu= t u. The main result is thatu(x, t) →f(x) almost everywhere fort → 0 iffH p (R2), wherep may be chosen <1/2. To get this result (improving on Vega’s work, see [6]), we devise a strategy to capture certain cancellations, which we believe has other applications in related problems.