A Two Weight Inequality for the Hilbert transform Assuming an Energy Hypothesis

Details A Two Weight Inequality for the Hilbert transform Assuming an Energy Hypothesis A Two Weight Inequality for the Hilbert transform Assuming an Energy Hypothesis

2010-01-22

arxiv.org/abs/1001.4043v7

Mathematics

Classical Analysis and ODEs

60 pages, 1 figure. v3. An important revision: The Energy Condition is reformulated, a key concept of the proof, is reformulat

Scientific paper

Subject to a range of side conditions, the two weight inequality for the Hilbert transform is characterized in terms of (1) a Poisson A_2 condition on the weights (2) A forward testing condition, in which the two weight inequality is tested on intervals (3) and a backwards testing condition, dual to (2). A critical new concept in the proof is an Energy Condition, which incorporates information about the distribution of the weights in question inside intervals. This condition is a consequence of the three conditions above. The Side Conditions are termed 'Energy Hypotheses'. At one endpoint they are necessary for the two weight inequality, and at the other, they are the Pivotal Conditions of Nazarov-Treil-Volberg. This new concept is combined with a known proof strategy devised by Nazarov-Treil-Volberg. A counterexample shows that the Pivotal Condition are not necessary for the two weight inequality.

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