Harmonic Analysis

We construct a decomposition of the identity operator on a Riemannian manifold M as a sum of smooth orthogonal projections subordinate to an open cover of M. This extends a decomposition on the real line by smooth orthogonal projection due to Coifman and Meyer (C. R. Acad. Sci. Paris, Sér. I Math., 312(3), 259–261 1991) and Auscher, Weiss, Wickerhauser (1992), and a similar decomposition when M is the sphere by Bownik and Dziedziul (Const. Approx., 41, 23–48 2015). We construct Parseval wavelet frames in L 2 (M ) for a general Riemannian manifold M and we show the existence of wavelet unconditional frames in L p (M ) for 1 < p < ∞.This is made possible thanks to smooth orthogonal projection decomposition of the identity operator on L 2 (M ), which was recently proven by the authors in [3]. We also show a characterization of Triebel-Lizorkin and Besov spaces on compact manifolds interms of magnitudes of coefficients of Parseval wavelet frames. We achieve this by showing that Hestenes operators are bounded on manifolds M with bounded geometry.