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High perturbations of a new Kirchhoff problem involving the pLaplace operator
Boundary Value Problems volume 2021, Article number: 98 (2021)
Abstract
In the present work we are concerned with the existence and multiplicity of solutions for the following new Kirchhoff problem involving the pLaplace operator:
where \(a, b > 0\), \(\Delta _{p} u := \operatorname{div}(\nabla u^{p2}\nabla u)\) is the pLaplace operator, \(1 < p < N\), \(p < q < p^{\ast }:=(Np)/(Np)\), \(\Omega \subset \mathbb{R}^{N}\) (\(N \geq 3\)) is a bounded smooth domain. Under suitable conditions on g, we show the existence and multiplicity of solutions in the case of high perturbations (λ large enough). The novelty of our work is the appearance of new nonlocal terms which present interesting difficulties.
Introduction and main result
In this paper, we are concerned with the existence and multiplicity of solutions for the following problem:
where \(a, b > 0\), \(\Delta _{p} u := \operatorname{div}(\nabla u^{p2}\nabla u)\) is the pLaplace operator, \(1 < p < N\), \(p < q < p^{\ast }:=(Np)/(Np)\), \(\Omega \subset \mathbb{R}^{N}\) (\(N \geq 3\)) is a bounded smooth domain, λ is a real parameter.
In what follows, we suppose that the continuous function g satisfies the following conditions:
 \((g_{1})\):

\(g \in C^{1}(\Omega \times \mathbb{R},\mathbb{R})\) and
$$ \bigl\vert g(x,s) \bigr\vert \leq C\bigl(1+ \vert s \vert ^{r1}\bigr) \quad \forall (x,s) \in \Omega \times \mathbb{R}, $$where \(C > 0\) and \(p < r < p^{\ast }\);
 \((g_{2})\):

\(g(x,s)=o(s^{p1})\) as \(s\to 0\);
 \((g_{3})\):

(ARcondition) there exist \(\theta \in (p, p^{\ast })\) and \(T > 0\) such that
$$ 0 < \theta G(x,s) \leq g(x,s)s \quad \mbox{for all } \vert s \vert \geq T, x \in \Omega , $$where \(G(x,s)=\int _{0}^{s} g(x,t)\,dt\);
 \((g_{3}^{*})\):

\(\lim_{x\rightarrow \infty }\frac{G(x,t)}{t^{p}} = \infty \) uniformly in \(x \in \Omega \);
 \((g_{3}^{**})\):

\(G(x,0) \in L^{1}(\Omega )\) and there exists \(\sigma \in L^{1}(\Omega )\) such that
$$ \mathcal{G}(x,t) \leq \mathcal{G}(x,s) + \sigma (x) $$for all \(0 \leq t \leq s\) or \(s \leq t \leq 0\), where \(\mathcal{G}(x,t) := g(x,t)t pG(x,t)\);
 \((g_{4})\):

\(g(x, s) = g(x,s)\) for all \((x,s) \in \Omega \times \mathbb{R}\).
The novelty of our work is the fact that we combine several different phenomena in one problem. The features of this paper are the following:

(1)
The continuous function g may satisfy the Ambrosetti–Rabinowitz condition or not.

(2)
The presence of the new nonlocal term \((a  b\int _{\Omega }\nabla u^{2}\,dx)\).
To the best of our knowledge, there few papers proving the existence and multiplicity of solutions with the combined effects generated by the above features.
Recently, nonlocal problems and operators have been widely studied in the literature and have attracted the attention of a lot of mathematicians coming from different research areas. A typical model proposed by Kirchhoff [4] serves as a generalization of the classic D’Alembert wave equation by taking into account the effects of the changes in the length of the strings during the vibrations. Thanks to the pioneering work of Lions [13], a lot of attention has been drawn to these nonlocal problems during the last decade. After that, some studies on this kind of problems have been performed by using different approaches, see [2, 6–12, 14, 15, 18, 19, 23] and the references therein.
In this paper, we mainly consider a new Kirchhoff problem involving the pLaplace operator, that is, the form with a nonlocal coefficient \((ab\int _{\Omega }\nabla u^{p}\,dx)\). Its background is derived from negative Young’s modulus, when the atoms are pulled apart rather than compressed together and the strain is negative. Recently, the authors in [22] first studied this kind of problem
where \(2< p<2^{*}:=(2N)/(N2)\), and they obtained the existence of solutions by using the mountain pass lemma. Furthermore, some interesting results have been obtained for this kind of Kirchhofftype problem. We refer the readers to [1, 3, 5, 16, 20–22] and the references therein.
From the abovementioned papers, it is a natural question to see what results can be recovered when this new Kirchhoff problem involves the pLaplace operator. Compared to the above papers, some difficulties arise in our paper when dealing with problem (1.1), because of the appearance of the nonlocal coefficient \((a  b\int _{\Omega }\nabla u^{p}\,dx)\) which provokes some mathematical difficulties, and these make the study of problem (1.1) particularly interesting. In addition, we need more delicate estimates which are not trivial, the method of this paper is obviously different from the literature works mentioned above.
If the nonlinear term g satisfies the ARcondition, we have the following existence results of problem (1.1).
Theorem 1.1
Suppose that assumptions \((g_{1})\)–\((g_{3})\) are fulfilled. Then there exists \(\lambda _{1} > 0\) such that, for any \(\lambda \geq \lambda _{1}\), problem (1.1) admits a nontrivial solution.
Theorem 1.2
Suppose that assumptions \((g_{1})\)–\((g_{3})\) and \((g_{4})\) are fulfilled. Then there exists \(\lambda _{2} > 0\) such that, for any \(\lambda \geq \lambda _{2}\), problem (1.1) admits a sequence of solutions with unbounded energy.
If the nonlinear term g satisfies not the ARcondition, our next main result in this paper is the following.
Theorem 1.3
Suppose that assumptions \((g_{1})\)–\((g_{2})\), \((g_{3}^{*})\), \((g_{3}^{**})\), and \((g_{5})\) are fulfilled. Then there exists \(\lambda _{3} > 0\) such that, for any \(\lambda \geq \lambda _{3}\), problem (1.1) admits a sequence of solutions with unbounded energy.
Remark 1.1
The main feature of problem (1.1) contains a nonlocal coefficient \((a  b\int _{\Omega }\nabla u^{2}\,dx)\), there is no doubt that we encounter serious difficulties because of the lack of compactness. To overcome the challenge, we must estimate precisely the value of c and give a threshold value. So the variational technique for problem (1.1) becomes more delicate. To the best of our knowledge, the present paper results have not been covered yet in the literature.
This paper is organized as follows. In Sect. 2, we give some necessary preliminary knowledge on the functional setting and prove the Palais–Smale compactness condition. In Sect. 3, we prove Theorem 1.1 by using the mountain pass theorem. In Sect. 4, we prove Theorems 1.2 and 1.3 via the symmetric mountain pass theorem where the nonlinear term g satisfies the ARcondition or not, respectively.
Preliminaries and compactness results
We seek weak solutions to problem (1.1) in \(W^{1,p}_{0}(\Omega )\) which is the usual Sobolev space with respect to the norm \(\u\ = \int _{\Omega }\nabla u^{p}\,dx\). We then have that \(W^{1,p}_{0}(\Omega )\) is continuously and compactly embedded into the Lebesgue space \(L^{\tau }(\Omega )\) endowed the norm \(u_{\tau }= (\int _{\Omega }u^{\tau } \,dx )^{\frac{1}{\tau }}\), \(p<\tau <p^{\ast }\). Denote by \(S_{\tau }\) the best constant for this embedding, that is,
In particular, if S is the best constant for the embedding \(W^{1,p}_{0}(\Omega ) \hookrightarrow L^{p^{\ast }} (\Omega )\), then it is defined by
We consider the energy functional \(J_{\lambda }: W^{1,p}_{0}(\Omega ) \to \mathbb{R}\) defined by
It is well known that a critical point of \(J_{\lambda }\) is a weak solution of problem (1.1) and the functional \(J_{\lambda }\) is of class \(C^{1}\) in \(W^{1,p}_{0}(\Omega )\) (see [17]). Denote by \(J_{\lambda }'\) the derivative operator of \(J_{\lambda }\) in the weak sense. Then
We recall that a \(C^{1}\) functional \(J_{\lambda }\) on the Banach space \(W^{1,p}_{0}(\Omega )\) is said to satisfy the Palais–Smale condition at level c (\((\mathit{PS})_{c}\) in short) if every sequence \(\{u_{n}\} \subset W^{1,p}_{0}(\Omega )\) satisfying \(J_{\lambda }(u_{n}) \rightarrow c\) and \(J_{\lambda }'(u_{n}) \rightarrow 0\) (\(n \rightarrow \infty \)) has a convergent subsequence.
Lemma 2.1
Assume that \((g_{1})\)–\((g_{3})\) hold. Then the functional \(J_{\lambda }\) satisfies the \((\mathit{PS})_{c}\) condition, where \(c \in (\infty , \frac{a^{2}}{2pb})\).
Proof
First, let \(\{u_{n}\}_{n} \subset W_{0}^{1,p}(\Omega )\) be a \((\mathit{PS})_{c}\) sequence associated with the functional \(J_{\lambda }\), that is,
Then, \(\{u_{n}\}_{n}\) is bounded in \(W_{0}^{1,p}(\Omega )\). In fact, arguing by contradiction, we assume that, passing eventually to a subsequence, still denoting by \(\{u_{n}\}_{n}\), we have \(\u_{n}\ \rightarrow +\infty \) as \(n \rightarrow +\infty \). By \((g_{3})\) we have
Thus, (2.4) leads to contradiction since \(1 < p\). Therefore, there exists \(u \in W_{0}^{1,p}(\Omega )\) such that up to a subsequence \(u_{n}\rightharpoonup u\) weakly in \(W_{0}^{1,p}(\Omega )\) and \(u_{n}\rightarrow u\) strongly in \(L^{s}(\Omega )\) with \(p\leq s < p^{*}\).
In the following, we will prove \(u_{n} \rightarrow u\) strongly in \(W_{0}^{1,p}(\Omega )\).
In fact, by the Hölder inequality, one has
and thus
On the other hand, by conditions \((g_{1})\) and \((g_{2})\), we have that for every \(\varepsilon > 0\) there exists \(C_{\varepsilon }> 0\) such that
This fact implies that
Thus
From
that
Therefore, we can deduce from (2.5) and (2.6) that
Since \(\{u_{n}\}_{n}\) is bounded in \(W_{0}^{1,p}(\Omega )\), passing to a subsequence, if necessary, we may assume that
Next, we distinguish the following two steps.
Step I: \(d \neq \frac{a}{b}\).
In this step, we have
This means that \(\{ab\int _{\Omega }\nabla u_{n}^{p}\,dx\}\) is bounded.
Step II: \(d = \frac{a}{b}\).
In this step, we have
Define
Then
It follows that
for all \(v \in W_{0}^{1,p}(\Omega )\). From the Hölder inequality and the embedding \(W_{0}^{1,p}(\Omega ) \hookrightarrow L^{s}(\Omega )\) (\(p \leq s < p^{*}\)) is compact, one has
and
Thus
Since
Hence \(\psi '(u_{n})\to 0\) as \(n\to \infty \), i.e.,
Then we have
By the fundamental lemma of the variational method (see [17]), it follows that \(u=0\). So
Hence, we see that
This is a contradiction since
Then (2.8) is not true and \(d \neq \frac{a}{b}\), this means that any subsequence of \(\{ab\u_{n}\^{p}\}\) does not converge to zero. Therefore there exists \(\delta >0\) such that \(ab\u_{n}\^{p}>\delta \) when n is large enough. It is clear that \(\{ab\u_{n}\\}\) is bounded.
Therefore, it follows from (2.7) that
Thus by the \((S_{+})\) property, \(u_{n}\to u\) strongly in \(W_{0}^{1,p}(\Omega )\). The proof is complete. □
Proof of Theorem 1.1
In this section, we first begin by giving the following general mountain pass theorem (see [17]).
Theorem 3.1
Let E be a Banach space and \(I_{\lambda }\in C^{1}(E, \mathbb{R})\) with \(J_{\lambda }(0)=0\). Suppose that
 \((A_{1})\):

there exist \(\rho , \alpha >0\) such that \(J_{\lambda }\geq \alpha \) for all \(u\in E\) with \(\u\=\rho \);
 \((A_{2})\):

there exists \(e\in E\) satisfying \(\e\_{E}>\rho \) such that \(I_{\lambda }(e)<0\).
Define \(\Gamma = \{ \gamma \in C([0,1],E) :\gamma (0)=0, \gamma (1)=e \} \).
and there exists a \((\mathit{PS})_{c}\) sequence \(\{{u_{n}}\}_{n}\subset E\).
Now, we begin proving that \(J_{\lambda }\) satisfies the assumptions of the mountain pass geometry.
Lemma 3.1
Under conditions \((g_{1})\)–\((g_{3})\), the functional \(J_{\lambda }\) satisfies the mountain pass geometry, that is,

(i)
there exist \(\alpha , \rho >0\) such that \(J_{\lambda }(u)\geq \alpha \) for any \(u \in W_{0}^{1,p}(\Omega )\) such that \(\u\ = \rho \);

(ii)
there exists \(e\in W_{0}^{1,p}(\Omega )\) with \(\e\ > \rho \) such that \(J_{\lambda }(e)<0\).
Proof
First, by conditions \((g_{1})\) and \((g_{2})\), we have that for every \(\varepsilon > 0\) there exists \(C_{\varepsilon }> 0\) such that
Taking \(\varepsilon > 0\) satisfies \(\frac{a}{2}\varepsilon S_{p}^{p} > 0\). Then, we can choose ρ, \(\alpha >0\) such that \(J_{\lambda }(u)\geq \alpha \) for \(\u\=\rho \), since \(p < q\) and \(p < r\). Hence \((A_{1})\) in Theorem 3.1 holds.
Next, we verify condition \((A_{2})\) of Theorem 3.1. By \((g_{3})\) we know that, for all \(T > 0\), there exists \(C_{T} > 0\) such that
Set \(v \in C_{0}^{\infty }(\Omega )\) and \(v\neq 0\). It follows from (3.2) that
From the fact that \(q, \theta > p\), we deduce that \(J_{\lambda }(t_{0}v) < 0\) and \(t_{0}\v\ > \rho \) for \(t_{0}\) large enough. Set \(e = t_{0}v\). Hence e is the required function and \((A_{2})\) in Theorem 3.1 is valid. This completes the proof. □
Proof of Theorem 1.1
Now, we claim that
for all sufficiently large λ.
In fact, in order to prove (3.4), we choose \(\nu \in W_{0}^{1,p}(\Omega )\setminus \{0\}\) such that \(\lim_{t\rightarrow \infty }J_{\lambda }(t\nu )=\infty \). Then
for some \(t_{\lambda }>0\). Hence \(t_{\lambda }\) satisfies
Then, by \((g_{3})\), we have
This fact implies that \(\{t_{\lambda }\}_{\lambda >0}\) is bounded since \(q > p\).
In the following, we prove that
Arguing by contradiction, we can assume that there exist \(t_{0}>0\) and a sequence \(\{\lambda _{n}\}_{n}\) with \(\lambda _{n}\rightarrow \infty \) as \(n\rightarrow \infty \) such that \(t_{\lambda _{n}}\rightarrow t_{0}\) as \(n\rightarrow \infty \). By the Lebesgue dominated convergence theorem, we deduce that
from which it follows that
However, (3.5) implies that this fact is absurd. Hence (3.7) holds.
From (3.7) and the definition of \(J_{\lambda }\), we get
So, for any \(\lambda >\lambda _{0}>0\), we have
If we take \(e=\tau \nu \) with τ large enough to verify \(J_{\lambda }(e)<0\), then we obtain
Therefore
Clearly, Lemmas 2.1, 3.1, and Theorem 3.1 give the existence of nontrivial critical points of \(J_{\lambda }\), and this concludes the proof. □
Proof of Theorems 1.2 and 1.3
To prove Theorems 1.2 and 1.3, we shall use the following symmetric mountain pass theorem in [17].
Theorem 4.1
(see [17])
Let \(X = Y \oplus Z\) be an infinite dimensional Banach space, where Y is finite dimensional, and let \(J\in C^{1}(X,\mathbb{R})\). Suppose that
 \((I_{1})\):

J satisfies the \((\mathit{PS})_{c}\) condition for all \(c > 0\);
 \((I_{2})\):

\(J(0)=0\), \(J(u)=J(u)\) for all \(u \in X\);
 \((I_{3})\):

There exist constants ρ, \(\alpha >0\) such that \(J(u)\ge \alpha \) for all \(u\in \partial B_{\rho }\bigcap Z\);
 \((I_{4})\):

For any finite dimensional subspace \(\widetilde{X}\subset X\), there is \(R=R(\widetilde{X})>0\) such that \(J(u)\leq 0\) on \(\widetilde{X}\setminus B_{R}\).
Then J possesses an unbounded sequence of critical values.
Proof of Theorem 1.2
We shall apply Theorem 4.1 to \(J_{\lambda }\). On the one hand, we know that \(W_{0}^{1,p}(\Omega )\) is a Banach space and \(J_{\lambda }\in C^{1}(W_{0}^{1,p}(\Omega ), \mathbb{R})\). The functional \(J_{\lambda }\) satisfies \(J_{\lambda }(0)=0\), \(J_{\lambda }(u)=J_{\lambda }(u)\). So, \((I_{2})\) of Theorem 4.1 is satisfied.
On the other hand, using a similar discussion as in (3.4), there exists \(\lambda _{2} > 0\) such that
By Lemma 2.1, one knows that \(J_{\lambda }\) satisfies the \((\mathit{PS})_{c}\) condition. Then \((I_{1})\) of Theorem 4.1 is satisfied.
In the following, we will prove that assumptions \((I_{3})\) and \((I_{4})\) of Theorem 4.1 are satisfied.
In fact, the proof of \((I_{3})\) is similar to the proof of \((i)\) in Lemma 3.1. So, we omit the proof here.
In order to prove \((I_{4})\) of Theorem 4.1, we take X̃ is the finite dimensional subspace of Banach space X. By (3.2), we deduce that
Because all the norms on the finite dimensional subspace X̃ are equivalent, there exists \(C>0\) such that
From these and (4.1), we have
Thus, there exists \(R=R(\widetilde{X})\) such that we can derive \(J_{\lambda }(u) < 0\) for all \(u \in \widetilde{X}\) with \(\u\ \geq R\). Consequently, \((I_{4})\) of Theorem 4.1 is satisfied.
Since all the assumptions of Theorem 4.1 are satisfied, problem (1.1) possesses infinitely many nontrivial solutions with unbounded energy. □
Proof of Theorem 1.3
If g satisfies conditions \((g_{1})\)–\((g_{2})\), \((g_{3}^{*})\), and \((g_{3}^{**})\). First, we claim that the functional \(J_{\lambda }\) satisfies the \((\mathit{PS})_{c}\) condition, where \(c \in (\infty , \frac{a^{2}}{2pb})\).
Indeed, we take \(\{u_{n}\}\subset W_{0}^{1,p}(\Omega )\) to be a \((\mathit{PS})_{c}\) sequence associated with the functional \(J_{\lambda }\), that is, \(J_{\lambda }(u_{n})\to c\) and \(J_{\lambda }'(u_{n})\to 0\) as \(n\to \infty \). By using \((g_{3}^{*})\) and \((g_{3}^{**})\), we have
This fact implies that \(\{u_{n}\}\) is bounded in \(W_{0}^{1,p}(\Omega )\) since \(1 < p\), \(\sigma \in L^{1}(\Omega )\) and \(\mathcal{G}(x,0) \in L^{1}(\Omega )\). Arguing as in the proof of Lemma 2.1, we can also prove \(u_{n}\to u\) strongly in \(W_{0}^{1,p}(\Omega )\), we omit the details here.
Next, we claim that assumptions \((I_{3})\) and \((I_{4})\) of Theorem 4.1 are also satisfied.
In fact, it is easy to prove that \((I_{3})\) of Theorem 4.1 is satisfied.
In the following, we prove that \((I_{4})\) of Theorem 4.1 is satisfied. On the one hand, by \((g_{3}^{*})\), we have
Hence, we deduce that
Similarly, arguing as in the proof of Theorem 1.2, we know that \((I_{4})\) of Theorem 4.1 is satisfied. Thus, problem (1.1) possesses infinitely many nontrivial solutions with unbounded energy. □
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Acknowledgements
The authors are very grateful to the editors for the careful reading of this manuscript and offering valuable comments for this manuscript.
Funding
Z. Zhang was supported by 2020 Nanjing Vocational College of Information Technology Doctoral special fund project “Study on the Climate Ensemble Forecast Model Based on the East Asian Monsoon Region” (YB20200902). Y.Q. Song was supported by the National Natural Science Foundation of China (No. 12001061), the Research Foundation of Department of Education of Jilin Province (JJKH20200821KJ).
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Zhang, Z., Song, Y. High perturbations of a new Kirchhoff problem involving the pLaplace operator. Bound Value Probl 2021, 98 (2021). https://doi.org/10.1186/s1366102101566x
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DOI: https://doi.org/10.1186/s1366102101566x
MSC
 35J60
 35J20
Keywords
 pLaplace operator
 New Kirchhoff problem
 Variational method