Abstract
On a complete doubling metric measure space \(({\mathcal {X}},d,\mu )\) supporting the weak Poincaré inequality, by establishing some capacitary strong-type inequalities for the Hardy–Littlewood maximal operator, we characterize such a measure \(\nu \) on \({\mathcal {X}}\times {\mathbb {R}}_+\) that \(f\mapsto \int _{{\mathcal {X}}} p_{t^2}(\cdot ,y)f(y)\,d\mu (y)\) is bounded from Newton–Sobolev space \(N^{1,p}({\mathcal {X}})\) under \(p\in [1,\infty )\) into the Lebesgue space \(L^q({\mathcal {X}}\times {\mathbb {R}}_+,\nu )\) with \(q\in {\mathbb {R}}_+\), where the kernel \(p_t\) satisfies certain two-sided estimate. This offers a priori estimate for the solution to the heat equation with a Newton–Sobolev data on the given metric measure space \({\mathcal {X}}\). Via taking \(t\rightarrow 0\), a characterization of \(\nu \) on \({\mathcal {X}}\) ensuring the continuity of \(N^{1,p}({\mathcal {X}})\subset L^q({\mathcal {X}},\nu )\) is also obtained.
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The authors would like to thank the anonymous referees for several helpful comments on the original version of this paper.
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L. Liu was supported by NNSF of China Grant # 11771446; J. Xiao was supported by NSERC of Canada Grant # 202979463102000; D. Yang was supported by NNSF of China Grant # 11571039 and #11671185; W. Yuan (the corresponding author) was supported by NNSF of China Grant # 11871100; L. Liu, D. Yang and W. Yuan were also supported by NNSF of China Grant #11761131002.
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Liu, L., Xiao, J., Yang, D. et al. Restriction of heat equation with Newton–Sobolev data on metric measure space. Calc. Var. 58, 165 (2019). https://doi.org/10.1007/s00526-019-1611-3
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DOI: https://doi.org/10.1007/s00526-019-1611-3