arXiv subjects

Huohao Zhang

Publications and source records attributed to Huohao Zhang.

2 recordsLinked to original sources

arXiv2026

BMO Classification for Two-Dimensional Dunkl Newton and Green Kernels

Using Gaussian heat-kernel estimates, we classify planar Dunkl Newton kernels in weighted Euclidean BMO and obtain the corresponding local classification for unit-ball Green kernels. For atomic Newton potentials supported on a regular reflection orbit, orbit BMO detects exactly whether the coefficients are constant along the orbit. We also prove an intrinsic Dunkl--CLMS theorem in the heat-semigroup Hardy space and derive intrinsic and Euclidean-source Newton--Wente estimates, extending the BMO--Hardy-space method of Chanillo and Li to the Dunkl setting. Further consequences include sharp local atomic estimates, same-domain criteria, a localized $L^1$-to-BMO bound, and a Brezis--Merle-type estimate.

math.AP↗

arXiv2025

Weak type $(1,1)$ bounds for Riesz transforms for elliptic operators in non-divergence form

Let $L=-\sum_{i,j=1}^n a_{ij}D_iD_j$ be the elliptic operator in non-divergence form with smooth real coefficients satisfying uniformly elliptic condition. Let $W$ be the global nonnegative adjoint solution. If $W\in A_2$, we prove that the Riesz transforms $\nabla L^{-\frac{1}{2}}$ is of weak type $(1,1)$ with respect to the measure $W(x)dx$. This, together with $L^2_W$ boundedness of Riesz transforms \cite{EHH}, implies that the Riesz transforms are bounded in $L^p_W$ for $1<p<2$. Our results are applicable to the case of real coefficients having sufficiently small BMO norm.

math.CA↗