8th International Conference on
Computational Harmonic Analysis

September 12-16, 2022

Ingolstadt, Germany

"Marcinkiewicz averages of smooth orthogonal projections on sphere"

Dziedziul, Karol

We construct a single smooth orthogonal projection with desired localization whose average under a group action yields the decomposition of the identity operator. For any full rank lattice $\Gamma \subset {R}^d$, a smooth projection is localized in a neighborhood of an arbitrary precompact fundamental domain $R^d/\Gamma$. We also show the existence of a highly localized smooth orthogonal projection, whose Marcinkiewicz average under the action of $SO(d)$, is a multiple of the identity on $L^2({S}^{d-1})$. As an application we construct highly localized continuous Parseval frames on the sphere.

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