Abstract
We derive a Harnack inequality for positive solutions of the f-heat equation and Gaussian upper and lower bound estimates for the f-heat kernel on complete smooth metric measure spaces with Bakry–Émery Ricci curvature bounded below. Both upper and lower bound estimates are sharp when the Bakry–Émery Ricci curvature is nonnegative. The main argument is the De Giorgi–Nash–Moser theory. As applications, we prove an \(L_f^1\)-Liouville theorem for f-subharmonic functions and an \(L_f^1\)-uniqueness theorem for f-heat equations when f has at most linear growth. We also obtain eigenvalues estimates and f-Green’s function estimates for the f-Laplace operator.
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Acknowledgments
The authors thank Professor Laurent Saloff-Coste for his help, and thank Professor Frank Morgan for his suggestions. The work was done when the first named author was visiting the Department of Mathematics at Cornell University, he thanks Professor Xiaodong Cao for his help and the Department of Mathematics for their hospitality. The second named author thanks Professors Xianzhe Dai and Guofang Wei for helpful discussions, constant encouragement and support. The first named author was partially supported by NSFC (11101267, 11271132) and the China Scholarship Council (201208310431). The second named author was partially supported by an AMS-Simons travel grant.
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Wu, JY., Wu, P. Heat kernel on smooth metric measure spaces and applications. Math. Ann. 365, 309–344 (2016). https://doi.org/10.1007/s00208-015-1289-6
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DOI: https://doi.org/10.1007/s00208-015-1289-6