Abstract
In this manuscript, we deal with an equation involving a combination of quasi-linear elliptic operators of local and non-local nature with p-structure, and concave–convex nonlinearities. The prototypical model is given by
where \(\Omega \subset \mathbb {R}^n\) is a bounded and smooth domain, \(s\in (0,1)\), \(2 \le p < \infty \), \(0<q(p)<p-1<r(p)<\infty \) and \(0<\lambda _p< \infty \), being \(\Delta _p\) and \((-\Delta )_p^s\) the p-Laplace and fractional p-Laplace operators, respectively. We study existence and global uniform and explicit boundedness results to weak solutions. Then, we perform an asymptotic analysis for the limit of a family of weak solutions \(\{u_p\}_{p\ge 2}\) as \(p \rightarrow \infty \), which converges, up to a subsequence (under suitable assumptions on the problem data), to a non-trivial profile with uniform and explicit bounds, enjoying of a universal Lipschitz modulus of continuity, and verifying a nonlinear limiting PDE in the viscosity sense, which exhibits both local/non-local character.
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Notes
Indeed, we may consider the Bourgain–Brezis–Mironescu’s constant:
$$\begin{aligned} C_{n,s,p} = (1-s)\left( \frac{1}{p} \int _{\mathbb {R}^n} |\langle t, \overrightarrow{e}\rangle | d\mathcal {H}^{n-1}(t) \right) , \end{aligned}$$where \(\overrightarrow{e}\) is any unit vector in \(\mathbb {R}^n\). Furthermore, the following asymptotic behavior holds true: \(\displaystyle \lim _{p \rightarrow \infty } \root p \of {C_{n,s,p}} = 1\). For this very reason, from now on, we will omit it in the definition of \((-\Delta )_p^s u\).
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Acknowledgements
We would like to thank Prof. Leandro M. Del Pezzo and Prof. Julio D. Rossi for many enlightening discussions with regard to local/non-local eigenvalue problem in [29] and its limit counterpart. This work was partially supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET-Argentina) under Grant PIP GI No. 11220150100036CO, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (PNPD/CAPES-UnB-Brazil) under Grant 88887.357992/2019-00 and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brazil) under Grant No. 310303/2019-2. A. Salort is a member of CONICET.
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Appendices
Appendix A: The (s, p)-eigenvalue problem and its limit setting
In this section, we state some results on the first eigenvalue and eigenfunction of \(\mathcal {P}_{s, p}\) with Dirichlet boundary condition. Given a bounded and open regular domain \(\Omega \subset \mathbb {R}^n\), for any \(s\in (0,1)\) and \(p>1\), the first eigenvalue, namely \(\lambda _1(s,p)\), is variationally characterized as the minimizer of following Rayleigh’s quotient (see [8, Section 1.2] for details):
Moreover, if \(\varphi _1 = \varphi _1(s,p)\in W^{1, p}_0(\Omega )\) is an associated eigenfunction, then it fulfills the equation
in the weak sense.
By arguing as in [8, Theorems 1.1 and 1.2], it can be proved that \(\lambda _1(s,p)\) is simple and its corresponding eigenfunctions are bounded and have constant sign. Furthermore, by supposing (without loss of generality) that \(\Vert \varphi _1\Vert _{L^p(\Omega )} = 1\), we have the following limiting characterization (see [8, Theorem 1.3] for more details):
Another interesting piece of information is that such an “\(\infty \)-eigenvalue” enjoys the following (useful and simple) geometric characterization (cf. [38, 43] for similar results in the local and non-local scenarios):
Theorem 1
([8, Theorem 1.3]) Under the above definition, we have that
where \(\displaystyle \mathfrak {R}_{\Omega } \mathrel {\mathop :}=\max _{x \in \Omega } \text {dist}(x, \partial \Omega )\). Moreover, there exists \(u_{\infty } \in W_0^{1,\infty }(\Omega )\), such that \(\Vert u_{\infty }\Vert _{L^{\infty }(\Omega )}=1\), \(u_p \rightarrow u_{\infty }\) uniformly in \(\Omega \) (up to subsequences) and
Finally, by using the same ideas as in Theorem 1.5 we are able to deduce the corresponding limit operator governing the limiting eigenvalue problem (cf. [29, Theorem 1.3]).
Theorem 2
([8, Theorem 1.4]) Assume that condition (A.1) holds. Then, any uniform limit of (normalized, i.e., \(\Vert \varphi \Vert _{L^{\infty }(\Omega )}=1\)) eigenfunctions corresponding to the first (s, p)-eigenvalue \(\lambda _1(s,p)\), is a viscosity solution to
where
and
Appendix B: The (s, p)-torsional creep problem and its limit counterpart
In this section, we study several properties of the (s, p)-torsional creep-type problem
Notice that existence of a weak solution of (B.1) follows from standard variational arguments. The Euler–Lagrange (or energy) functional \(\mathrm {H}_{s, p}:W^{1,p}_0(\Omega ) \rightarrow \mathbb {R}\) associated with such a problem is defined as follows:
We are now in a position to present the existence/uniqueness’ result to (B.1).
Lemma B.1
Let \(s\in (0,1)\) and \(p>\frac{n}{s}\) be fixed. Then, there exists a unique weak solution of (B.1), which is a minimizer of \(\mathrm {H}_{s, p}\) on \(W^{1,p}_0(\Omega )\).
Proof
First of all, observe that \(\mathrm {H}_{s, p}\) is coercive in \(W^{1,p}_0(\Omega )\). Indeed, by using Hölder’s inequality and the characterization of ((s, p)-Eigenvalue) we get that
At this point, we stress that the function
is bounded from below, and in addition, \(\mathrm {g}_p(t)\rightarrow \infty \) when \(t\rightarrow \infty \), thereby providing the desired property. Moreover, since it is clear that \(\mathrm {H}_{s, p}\) is also lower semi-continuous, existence of a minimizer can be ensured by applying the direct methods in the calculus of variations.
Finally, uniqueness follows from the strict convexity of \(\mathrm {H}_{s, p}\), which, in turn, follows from the strict monotonicity of the operators \(-\Delta _p\) and \((-\Delta )_p^s\), respectively. Lastly, it is clear that any minimizer to \(\mathrm {H}_{s, p}\) is a weak solution to (B.1). This concludes the proof. \(\square \)
In the sequel, we establish a key result which ensures that any family of solutions to (B.1) is uniformly bounded in \(W^{1,p}_0(\Omega )\).
Lemma B.2
Let \(\tau _p\) be a weak solution of (B.1). Then, there exists \(C_p>0\) such that
Proof
Remember that a weak solution \(\tau _p\) of (B.1) satisfies the following integral relation:
One more time, by using Hölder’s inequality and ((s, p)-Eigenvalue) we obtain the following:
Therefore, by defining \(\mathrm {h}_p(t)=t^p - \frac{1}{\root p \of {\lambda _1(s,p)}}\mathcal {L}^n(\Omega )^{1-\frac{1}{p}}t\) we get
Now, notice that
Particularly, this implies that
which concludes the proof. \(\square \)
Next, we prove a convergence result for any family of solutions to (B.1).
Lemma B.3
Let \(\{\tau _p\}_{p \ge 2}\) be a family of weak solution to (B.1). Then, up to subsequence,
In addition, \(\tau _\infty \in W^{1,\infty }_0(\Omega )\) and the following (uniform) estimates hold true
Proof
Let \(\{\tau _p\}_{p \ge 2}\) be any sequence of weak solutions of (B.1). By Morrey’s inequality (Proposition 2.7) and Hölder embedding (Theorem 2.8), we have that
which implies the uniform boundedness and pre-compactness for \(p\gg 1\) sufficiently large. Hence, by Arzelá–Ascoli compactness criterion, there exists a subsequence of \(\{\tau _p\}_{p \ge 2}\) such that
and such that \(\tau _\infty =0\) in \(\mathbb {R}^n{\setminus } \Omega \).
Finally, notice that by sending \(p\rightarrow \infty \), since \(\displaystyle \lim _{p \rightarrow \infty } C_p = 1\) (see Lemma B.2), we conclude that \(\tau _\infty \in W^{1, \infty }_0(\Omega )\) (extended to zero outside \(\Omega \)) and the desired estimates in (B.2) hold true. \(\square \)
From Lemmas B.2 and B.3, there exists a function \(\tau _\infty \) such that \(\tau _p\rightarrow \tau _\infty \) uniformly in \({\bar{\Omega }}\). Therefore, applying mutatis mutandis the arguments in the proof of Theorem 1.5 we obtain a characterization of the limit equation fulfilled by the limit profile (in the viscosity sense). We leave the interested reader to verify the details.
Theorem B.4
Let \(\Omega \subset \mathbb {R}^n\) be a bounded domain and \(p>n\). Then, the sequence \(\{\tau _p\}_{p\ge 2}\) of weak solutions of (B.1) converge uniformly as \(p\rightarrow \infty \) to a viscosity solution to
where
and
Appendix C: The (s, p)-concave problem and its limit scenario
In this final section, we deal with the (s, p)-concave problem given by
where \(q=q(p)\) is assumed to satisfy (LC).
We start by proving existence/uniqueness of weak solutions of the concave problem (C.1).
Lemma C.1
Let \(\Omega \subset \mathbb {R}^n\) be a bounded and regular domain, \(p>n\) and \(0<q<p-1\). Then, for any \(\lambda _p>0\) there exists a unique weak solution \(\kappa _p \in W^{1,p}_0(\Omega )\) of (C.1).
Proof
In light of Proposition 2.6, existence of a weak solution will follow if we can find a sub-solution \(\underline{v}\) and a super-solution \(\overline{v}\) of (C.1) such that \(\underline{v}\le \overline{v}\).
In order to construct a sub-solution, according to Appendix 4, let \(\lambda _1(s,p)\) be the first eigenvalue of \(\mathcal {P}_{s, p}\) in \(\Omega \) with (zero) Dirichlet boundary condition, and let \(\varphi _1(s,p)\) be the corresponding eigenfunction normalized such that \(\Vert \varphi _1\Vert _{L^{\infty }(\Omega )}=1\). Now, we define \(\underline{v}=\theta \varphi _1 \in W^{s, p}_0(\mathbb {R}^n)\) with \(\theta >0\) to be chosen a posteriori. Then, for any nonnegative \(\psi \in W^{1,p}_0(\Omega )\) it holds that
Therefore, \(\underline{v}\) is the required weak sub-solution provided we choose \(\theta \) such that
In the sequel, let us construct a weak super-solution. For this purpose, we choose a larger (regular) domain \({\tilde{\Omega }} \supset \Omega \) with eigenvalue \({\tilde{\lambda }}_1 = {\tilde{\lambda }}_1(s,p)\) such that the corresponding positive eigenfunction \({\tilde{\varphi }}_1 = {\tilde{\varphi }}_1(s,p)\) is normalized with \(\displaystyle \min _{x\in \Omega } {\tilde{\varphi }}_1=1\).
Now, we define \(\overline{v}=\iota (1+{\tilde{\varphi }}_1)\). Observe that \(\overline{v}\ge 2\iota \) in \(\Omega \). For this reason, by taking \(\iota \) large enough (to be explicitly chosen a posteriori), we ensure that \(\overline{v}\ge \underline{v}\) in \(\Omega \). Moreover, for any nonnegative \({\tilde{\psi }}\in W^{1, p}_0({\tilde{\Omega }})\) it holds that
As a result, we find that \(\overline{v}\) is the desired weak super-solution (in \(\Omega \)) provided \(\iota >0\) fulfills:
where we have used that \( W^{1,p}_0(\Omega ) \subset W^{1,p}_0({\tilde{\Omega }})\).
In conclusion, we remark that for \(p \gg 1\) large enough, in view of (LC) and (A.1) we can choose both \(\theta \) and \(\iota \) independent of p as follows:
The proof is now concluded. \(\square \)
Finally, we derive the corresponding limiting operator governing the limit of any family to the associated concave problem C.1.
Theorem C.2
Let \(\Omega \subset \mathbb {R}^n\) be a bounded and regular domain. Suppose that assumptions (LC) are in force. Then, the sequence of weak solutions \((\kappa _p)_{p\ge 2}\) of (C.1) converges uniformly to \(\kappa _{\infty }\), a viscosity solution of
where
and
Proof
The uniform convergence of the sequence follows with the same arguments that in the proofs of Theorem 1.3 and Proposition 4.1. The equation satisfied by the limit profile can be deduced with the same procedure that in Theorem 1.5. \(\square \)
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da Silva, J.V., Salort, A.M. A limiting problem for local/non-local p-Laplacians with concave–convex nonlinearities. Z. Angew. Math. Phys. 71, 191 (2020). https://doi.org/10.1007/s00033-020-01419-0
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DOI: https://doi.org/10.1007/s00033-020-01419-0
Keywords
- Existence of positive solutions
- Uniform bounds of solutions
- Uniform regularity estimates
- Concave–convex nonlinearities
- Local/non-local p-Laplacians
- Hölder \(\infty \)-Laplacian and \(\infty \)-Laplacian