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Weighted Sobolev Spaces on Metric Measure Spaces (1406.3000v3)
Published 11 Jun 2014 in math.AP, math.FA, and math.MG
Abstract: We investigate weighted Sobolev spaces on metric measure spaces $(X,d,m)$. Denoting by $\rho$ the weight function, we compare the space $W{1,p}(X,d,\rho m)$ (which always concides with the closure $H{1,p}(X,d,\rho m)$ of Lipschitz functions) with the weighted Sobolev spaces $W{1,p}_\rho(X,d,m)$ and $H{1,p}_\rho(X,d,m)$ defined as in the Euclidean theory of weighted Sobolev spaces. Under mild assumptions on the metric measure structure and on the weight we show that $W{1,p}(X,d,\rho m)=H{1,p}_\rho(X,d, m)$. We also adapt results by Muckenhoupt and recent work by Zhikov to the metric measure setting, considering appropriate conditions on $\rho$ that ensure the equality $W{1,p}\rho(X,d,m)=H{1,p}\rho(X,d,m)$.