Mathematics – Functional Analysis
Scientific paper
1997-04-07
Duke Math J. 91 (1998), 393-408
Mathematics
Functional Analysis
Also available at http://www.math.missouri.edu/~stephen/preprints/
Scientific paper
Let $u(x,t)$ be the solution of the Schr\"odinger or wave equation with $L_2$ initial data. We provide counterexamples to plausible conjectures involving the decay in $t$ of the $\BMO$ norm of $u(t,\cdot)$. The proofs make use of random methods, in particular, Brownian motion. (Since this paper was written, the unsolved problem remaining in this paper has been solved by Keel and Tao.)
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