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Qualitative properties of singular solutions to fractional elliptic equations

Part of: Theory of singularities and catastrophe theory Miscellaneous topics - Partial differential equations Singularities

Published online by Cambridge University Press:  14 September 2021

Shuibo Huang ,
Zhitao Zhang  and
Zhisu Liu
Shuibo Huang
Affiliation:
School of Mathematics and Computer Science, Northwest Minzu University, Lanzhou, Gansu 730030, P. R. China Key Laboratory of Streaming Data Computing Technologies and Application, Northwest Minzu University, Lanzhou, Gansu 730030, P. R. China ([email protected])
Zhitao Zhang*
Affiliation:
School of Mathematical Sciences, Jiangsu University, Zhenjiang 212013, P. R. China HLM, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, P. R. China School of Mathematical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China ([email protected])
Zhisu Liu
Affiliation:
Center for Mathematical Sciences, China University of Geosciences, Wuhan, Hubei 430074, P. R. China ([email protected])
*
*Corresponding author.
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Abstract

In this paper, by the moving spheres method, Caffarelli-Silvestre extension formula and blow-up analysis, we study the local behaviour of nonnegative solutions to fractional elliptic equations

\begin{align*} (-\Delta)^{\alpha} u =f(u),~~ x\in \Omega\backslash \Gamma, \end{align*}
where $0<\alpha <1$, $\Omega = \mathbb {R}^{N}$ or $\Omega$ is a smooth bounded domain, $\Gamma$ is a singular subset of $\Omega$ with fractional capacity zero, $f(t)$ is locally bounded and positive for $t\in [0,\,\infty )$, and $f(t)/t^{({N+2\alpha })/({N-2\alpha })}$ is nonincreasing in $t$ for large $t$, rather than for every $t>0$. Our main result is that the solutions satisfy the estimate
\begin{align*} f(u(x))/ u(x)\leq C d(x,\Gamma)^{{-}2\alpha}. \end{align*}
 This estimate is new even for $\Gamma =\{0\}$. As applications, we derive the spherical Harnack inequality, asymptotic symmetry, cylindrical symmetry of the solutions.

Keywords

Fractional elliptic equationsMoving spheres methodBlow-up analysisLocal behaviourSingular solutions

MSC classification

Primary: 35R11: Fractional partial differential equations
Secondary: 58K55: Asymptotic behavior 32S05: Local singularities
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 152 , Issue 5 , October 2022 , pp. 1155 - 1190
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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