科研之友
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摘要
In this paper we concern with the multiplicity and concentration of positive solutions for the semilinear Kirchloff type equation {-(epsilon(2)a + b epsilon integral(R3) vertical bar del u vertical bar(2)) Delta u + M(x)u = gimel f(u) + vertical bar u vertical bar(4)u, x epsilon R-3, u epsilon H-1(R-3), u > 0, x epsilon R-3, where epsilon > 0 is a small parameter, a, b are positive constants and gimel > 0 is a parameter, and f is a continuous superlinear and subcritical nonlinearity. Suppose that M(x) has at least one minimum. We first prove that the system has a positive ground state solution u(epsilon) for gimel > 0 sufficiently large and e > 0 sufficiently small. Then we show that tie converges to the positive ground state solution of the associated limit problem and concentrates to a minimum point of M(x) in certain sense as epsilon -> 0. Moreover, some further properties of the ground state solutions are also studied. Finally, we investigate the relation between the number of positive solutions and the topology of the set of the global minima of the potentials by minimax theorems and the LjusternikSchnirelmann theory.
