文摘
Let \((X, d, \mu )\) be a metric measure space endowed with a distance \(d\) and a nonnegative Borel doubling measure \(\mu \). Let \(L\) be a second-order non-negative self-adjoint operator on \(L^2(X)\). Assume that the semigroup \(e^{-tL}\) generated by \(L\) satisfies Gaussian upper bounds. In this article we establish a discrete characterization of weighted Hardy spaces \(H_{L, S, w}^{p}(X)\) associated with \(L\) in terms of the area function characterization, and prove its weighted atomic decomposition, where \(0<p\le 1\) and a weight \(w\) is in the Muckenhoupt class \(A_{\infty }\). Further, we introduce a Moser type estimate for \(L\) to show the discrete characterization for the weighted Hardy spaces \(H_{L, G, w}^{p}(X)\) associated with \(L\) in terms of the Littlewood–Paley function and obtain the equivalence between the weighted Hardy spaces in terms of the Littlewood–Paley function and area function.