Let $L$ be a non-negative self-adjoint operator on $L^2(\mathbb{ R}^n)$. By spectral theory, we can define the operator $F(L)$, which is bounded on $L^2(X)$, for any bounded Borel function $F$. In this paper, we study the sharp weighted $L^p$ estimates for spectral multipliers $F(L)$ and their commutators $[b, F(L)]$ with BMO functions $b$. We would like to emphasize that the Gaussian upper bound condition on the heat kernels associated to the semigroups $e^{ -tL}$ is not assumed in this paper.
Categories: math.CA