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On the failure of lower square function estimates in the non-homogenous weighted setting.

Recent Developments in Harmonic Analysis May 15, 2017 - May 19, 2017

May 19, 2017 (02:00 PM PDT - 03:00 PM PDT)
Speaker(s): Stefanie Petermichl (Université de Toulouse III (Paul Sabatier))
Location: MSRI: Simons Auditorium
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Abstract

We show that the classical A_infinity condition is not sufficient for a lower square function estimate in the non-homogeneous weighted L^2 space. We also show that under the martingale A_2 condition, an estimate holds true, but the optimal power of the characteristic jumps from 1 / 2 to 1. This is in a sharp contrast to recent positive results in this direction on the discrete time non-homogeneous martingale transforms. Joint work with Domelevo, Ivanisvili, Treil, Volberg while in residence at MSRI.

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Petermichi

H.264 Video 17-Petermichi.mp4 410 MB video/mp4 rtsp://videos.msri.org/data/000/028/481/original/17-Petermichi.mp4 Download
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