- Research Article
- Open Access
On a Perturbed Dirichlet Problem for a Nonlocal Differential Equation of Kirchhoff Type
© Giovanni Anello. 2011
- Received: 24 May 2010
- Accepted: 26 July 2010
- Published: 9 August 2010
We study the existence of positive solutions to the following nonlocal boundary value problem in , on , where , is a Carathéodory function, is a positive continuous function, and is a real parameter. Direct variational methods are used. In particular, the proof of the main result is based on a property of the infimum on certain spheres of the energy functional associated to problem in , .
- Weak Solution
- Global Minimum
- Dirichlet Problem
- Standard Result
- Regularity Result
Here is an open bounded set in with smooth boundary , , is a Carathéodory function, is a positive continuous function, is a real parameter, and is the standard norm in . In what follows, for every real number , we put .
When ( ), the equation involved in problem ( ) is the stationary analogue of the well-known equation proposed by Kirchhoff in . This is one of the motivations why problems like ( ) were studied by several authors beginning from the seminal paper of Lions . In particular, among the most recent papers, we cite [3–7] and refer the reader to the references therein for a more complete overview on this topic.
The case was considered in  and , where the existence of at least one positive solution is established under various hypotheses on . In particular, in  the nonlinearity is supposed to satisfy the well-known Ambrosetti-Rabinowitz growth condition; in  satisfies certain growth conditions at and , and is nondecreasing on for all . Critical point theory and minimax methods are used in  and . For and , the existence of a nontrivial solution as well as multiple solutions for problem ( ) is established in  and  by using critical point theory and invariant sets of descent flow. In these papers, the nonlinearity is again satisfying suitable growth conditions at and . Finally, in , where the nonlinearity is replaced by a more general and the nonlinearity is multiplied by a positive parameter , the existence of at least three solutions for all belonging to a suitable interval depending on and and for all small enough (with upper bound depending on ) is established (see [6, Theorem ]). However, we note that the nonlinearity does not meet the conditions required in . In particular, condition of [6, Theorem ] is not satisfied by . Moreover, in  the nonlinearity is required to satisfy a subcritical growth at (and no other condition).
Our aim is to study the existence of positive solution to problem ( ), where, unlike previous existence results (and, in particular, those of the aforementioned papers), no growth condition is required on . Indeed, we only require that on a certain interval the function is bounded from above by a suitable constant , uniformly in . Moreover, we also provide a localization of the solution by showing that for all we can choose the constant in such way that there exists a solution to ( ) whose distance in from the unique solution of the unperturbed problem (that is problem ( ) with ) is less than .
Our first main result gives some conditions in order that the energy functional associated to the unperturbed problem ( ) has a unique global minimum.
From now on, whenever the function satisfies the assumption of Theorem 2.1, we denote by the unique global minimum of the functional defined in (2.1). Moreover, for every and , we denote by the closed ball in centered at with radius . The next result shows that the global minimum is strict in the sense that the infimum of on every sphere centered in is strictly greater than .
which is impossible.
that is absurd. The proof is now complete.
where is the embedding constant of in . Therefore, grows as at . If , it seems somewhat hard to find a lower bound for . However, with regard to this question, it could be interesting to study the behavior of on varying of the parameter for every fixed . For instance, how does behave as ? Another question that could be interesting to investigate is finding the exact value of at least for some particular value of (for instance ) even in the case of .
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