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Global heat kernel estimates for fractional Laplacians in unbounded open sets
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  • Published: 09 December 2009

Global heat kernel estimates for fractional Laplacians in unbounded open sets

  • Zhen-Qing Chen1 &
  • Joshua Tokle1 

Probability Theory and Related Fields volume 149, pages 373–395 (2011)Cite this article

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  • 22 Citations

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Abstract

In this paper, we derive global sharp heat kernel estimates for symmetric α-stable processes (or equivalently, for the fractional Laplacian with zero exterior condition) in two classes of unbounded C 1,1 open sets in \({\mathbb R^d}\): half-space-like open sets and exterior open sets. These open sets can be disconnected. We focus in particular on explicit estimates for p D (t, x, y) for all t > 0 and \({x, y\,{\in}\,D}\). Our approach is based on the idea that for x and y in D far from the boundary and t sufficiently large, we can compare p D (t, x, y) to the heat kernel in a well understood open set: either a half-space or \({\mathbb R^d}\); while for the general case we can reduce them to the above case by pushing x and y inside away from the boundary. As a consequence, sharp Green functions estimates are obtained for the Dirichlet fractional Laplacian in these two types of open sets. Global sharp heat kernel estimates and Green function estimates are also obtained for censored stable processes (or equivalently, for regional fractional Laplacian) in exterior open sets.

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Authors and Affiliations

  1. Department of Mathematics, University of Washington, Seattle, WA, 98195, USA

    Zhen-Qing Chen & Joshua Tokle

Authors
  1. Zhen-Qing Chen
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  2. Joshua Tokle
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Corresponding author

Correspondence to Zhen-Qing Chen.

Additional information

Research partially supported by NSF Grants DMS-0600206 and DMS-0906743.

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Cite this article

Chen, ZQ., Tokle, J. Global heat kernel estimates for fractional Laplacians in unbounded open sets. Probab. Theory Relat. Fields 149, 373–395 (2011). https://doi.org/10.1007/s00440-009-0256-0

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  • Received: 06 June 2009

  • Revised: 21 October 2009

  • Published: 09 December 2009

  • Issue Date: April 2011

  • DOI: https://doi.org/10.1007/s00440-009-0256-0

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Keywords

  • Symmetric stable process
  • Fractional Laplacian
  • Censored stable process
  • Heat kernel
  • Transition density function
  • Green function
  • Parabolic Harnack inequality
  • Comparison method

Mathematics Subject Classification (2000)

  • Primary 60J35
  • 47G20
  • 60J75
  • Secondary 47D07
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