Acta mathematica scientia,Series A ›› 2023, Vol. 43 ›› Issue (5): 1341-1349.

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Exact Multiplicity of Positive Solutions for a Semipositone Mean Curvature Problem with Concave Nonlinearity

Li Xiaodong*(),Gao Hongliang(),Xu Jing   

  1. Department of Mathematics, Lanzhou Jiaotong University, Lanzhou 730070
  • Received:2022-10-09 Revised:2023-04-10 Online:2023-10-26 Published:2023-08-09
  • Contact: Xiaodong Li E-mail:LXD5775@163.com;gaohongliang101@163.com
  • Supported by:
    NSFC(11801243);NSFC(11961039);Gansu Province Colleges and Universities Young Doctor fund project(2022QB-056);Young Scholars Science Foundation of Lanzhou Jiaotong University(2017012)

Abstract:

In this paper, we study the exact multiplicity and bifurcation diagrams of positive solutions for the prescribed mean curvature problem in one-dimensional Minkowski space in the form of

$ \left\{\begin{array}{ll} -\left(\frac{u'}{\sqrt{1-u'^{2}}}\right)'=\lambda f(u), x\in(-L,L),\\ u(-L)=0=u(L), \end{array} \right. $

where $\lambda>0$ is a bifurcation parameter and $L>0$ is an evolution parameters, $f\in C^{2}([0,\infty), \mathbb{R})$ satisfies $f(0)<0$ and $f$ is concave for $0. In two different cases, we obtain that the above problem has zero, exactly one, or exactly two positive solutions according to different ranges of $\lambda$. The arguments are based upon a detailed analysis of the time map.

Key words: Minkowski space, Semipositone, Positive solution, Time map, Exact multiplicity

CLC Number: 

  • O175.8
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