Sparse domination for $q$-variation associated with functional calculus

Abstract

We establish sparse domination for the $q$-variation of functional calculus families $\{\phi (tL){\}}_{t>0}$ on spaces of homogeneous type. Under generalized Gaussian estimates, we consider holomorphic multipliers of injective accretive operators, and Sobolev-type spectral multipliers of non-negative self-adjoint operators. For the Sobolev-type multipliers, we show that our regularity assumption is sharp in general except the endpoint. As corollaries, we obtain weighted $q$-variational estimates for Bochner-Riesz means and regularized Schrödinger groups. Finally, we give several examples of operators to which our results apply.

arXiv comment42 pages