数学物理学报(英文版) ›› 2016, Vol. 36 ›› Issue (3): 666-682.doi: 10.1016/S0252-9602(16)30030-3

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NONEXISTENCE OF POSITIVE SOLUTIONS FOR A SEMI-LINEAR EQUATION INVOLVING THE FRACTIONAL LAPLACIAN IN RN

Yan LI   

  1. Department of Mathematical Sciences, Yeshiva University, New York, NY 10033, USA
  • 收稿日期:2015-05-13 修回日期:2015-09-09 出版日期:2016-06-25 发布日期:2016-06-25
  • 作者简介:Yan LI,E-mail:yali3@mail.yu.edu

NONEXISTENCE OF POSITIVE SOLUTIONS FOR A SEMI-LINEAR EQUATION INVOLVING THE FRACTIONAL LAPLACIAN IN RN

Yan LI   

  1. Department of Mathematical Sciences, Yeshiva University, New York, NY 10033, USA
  • Received:2015-05-13 Revised:2015-09-09 Online:2016-06-25 Published:2016-06-25

摘要:

In this paper, we consider the semilinear equation involving the fractional Lapla-cian in the Euclidian space Rn:
(-Δ)α/2u(x)=f(xn)up(x), x∈Rn (0.1)
in the subcritical case with 1< p< (n+α)/(n-α). Instead of carrying out direct investigations on pseudo-differential equation (0.1), we first seek its equivalent form in an integral equation as below:
u(x)=∫Rn G(x, y) f(yn)up(y)dy, (0.2)
where G(x, y) is the Green's function associated with the fractional Laplacian in Rn. Em-ploying the method of moving planes in integral forms, we are able to derive the nonexistence of positive solutions for (0.2) in the subcritical case. Thanks to the equivalence, same con-clusion is true for (0.1).

关键词: the fractional Laplacian, method of moving planes in integral forms, nonexistence of positive solutions, subcritical case

Abstract:

In this paper, we consider the semilinear equation involving the fractional Lapla-cian in the Euclidian space Rn:
(-Δ)α/2u(x)=f(xn)up(x), x∈Rn (0.1)
in the subcritical case with 1< p< (n+α)/(n-α). Instead of carrying out direct investigations on pseudo-differential equation (0.1), we first seek its equivalent form in an integral equation as below:
u(x)=∫Rn G(x, y) f(yn)up(y)dy, (0.2)
where G(x, y) is the Green's function associated with the fractional Laplacian in Rn. Em-ploying the method of moving planes in integral forms, we are able to derive the nonexistence of positive solutions for (0.2) in the subcritical case. Thanks to the equivalence, same con-clusion is true for (0.1).

Key words: the fractional Laplacian, method of moving planes in integral forms, nonexistence of positive solutions, subcritical case

中图分类号: 

  • 35A01