2025/02/24 by Xi Cen, Cen, Xi
Mathematics · #35J05 #42B20 #42B25 #47B47 #Advanced Harmonic Analysis Research #Analysis of PDEs (math.AP) #Classical Analysis and ODEs (math.CA) #Differential Equations and Boundary Problems #FOS: Mathematics #Functional Analysis (math.FA) #Numerical methods in inverse problems
paper · pdf · doi:10.48550/arxiv.2502.17300
openalex publication_date 2025/02/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
This paper refines the main results from our previous study on sparse bounds of generalized commutators of multilinear fractional singular integral operators in \citeCenSong2412. The key improvements are: 1. We replace pointwise domination with the (m+1)-linear fractional sparse form \mathcal A_η,S,τ,r,s'b,k,t, advancing the vector-valued multilinear fractional sparse form domination principle, and relax conditions from multilinear weak type boundedness to multilinear locally weak type boundedness W_p, q(X). 2. We introduce a multilinear fractional r-type maximal operator \mathscrM_η,r and develop a new class of weights A_(p,q),(r, s)(X) to characterize it, establishing norm equivalence with the sparse forms. 3. This norm equivalence provides sharp quantitative weighted estimates for (m+1)-linear fractional sparse form, removing exponent parameter limitations and achieving sharp operator norm bounds. 4. We demonstrate applications in two ways: (1) Providing sharp or Bloom type estimates for generalized commutators of multilinear fractional Calderón--Zygmund operators and multilinear fractional rough singular integral operators. (2) Investigating sparse form type weighted Lebesgue Lp(ω) and weighted Sobolev Ws,p(ω) regularity estimates for solutions of fractional Laplacian equations with higher-order commutators.