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May  2020, 19(5): 2839-2852. doi: 10.3934/cpaa.2020124

## Nonexistence results on the space or the half space of $-\Delta u+\lambda u = |u|^{p-1}u$ via the Morse index

 1 Department of Mathematics, Northern Border university, Arar, Saudi Arabia, Université de Tunis, Département de Mathématiques, , Faculté des Sciences de Bizerte, Zarzouna, 7021 Bizerte, Tunisia 2 Department of Mathematics, Northern Border university, Arar, Saudi Arabia, Université de Kairouan, Département de Mathématiques, , Institut Superieur des Mathématiques Appliquées et de l'Informatique 3 Faculté des Sciences, Département de Mathématiques, , B.P 1171 Sfax 3000, Université de Sfax, Tunisia

*Corresponding author

Received  June 2019 Revised  October 2019 Published  March 2020

Fund Project: This work is supported by Deanship of the Scientific Research of Northern Border University. KSA, grant no. SCI-2018-3-9-F-7713

In this paper we consider the following semi-linear elliptic problem
 $\begin{equation*} -\Delta u+\lambda u = |u|^{p-1}u\quad\mbox{in}\,\, \mathcal{O}, \tag{P} \end{equation*}$
where
 $\mathcal{O} = \mathbb{R}^N$
; or
 $\mathcal{O} = \mathbb{R}^N_+ = \{x = (x',x_N),\, x'\in \mathbb{R}^{N-1},x_N>0\}$
with Dirichlet boundary conditions. Here
 $N\geq2$
,
 $p>1$
and
 $\lambda$
is a positive real parameter. The main goal ofthis work is to analyze the influence of the linear term
 $\lambda u$
, in order to classify regular stable solutions possibly unbounded and sign-changing. Our analysis reveals the nonexistence of nontrivial stable solutions (respectively solutions which are stable outside a compact set) for all
 $p> 1$
(respectively for all
 $p\geq \frac{N+2}{N-2}$
, or
 $1 and $ |u|^{p-1}<\frac{\lambda (p+1)}{2} $). Inspired by [6,9,16,23], we establish a monotonicity formula to discuss the supercritical case. Regarding the case $ \mathcal{O} = \mathbb{R}^N $, we obtain a complete classification which states that problem $ (P) $has regular solutions which are stable outside a compact set if and only if $ p\in (1,\infty) $and $ N = 2 $; or $ p\in(1,\frac{N+2}{N-2}) $and $ N\geq3. $Citation: Abdelbaki Selmi, Abdellaziz Harrabi, Cherif Zaidi. Nonexistence results on the space or the half space of$ -\Delta u+\lambda u = |u|^{p-1}u $via the Morse index. Communications on Pure & Applied Analysis, 2020, 19 (5) : 2839-2852. doi: 10.3934/cpaa.2020124 ##### References:  [1] L. Ambrosio and X. Cabré, Entire solutions of semilinear elliptic equations in$ \mathbb{R}^3$and a conjecture of De Giorgi, J. Amer. Math. Soc., 13 (2000), 725-739. doi: 10.1090/S0894-0347-00-00345-3. Google Scholar [2] A. Bahri and P. L. Lions, Solutions of superlinear elliptic equations and their Morse indices, Commun. Pure. App. Math., 45 (1992), 1205-1215. doi: 10.1002/cpa.3160450908. Google Scholar [3] M. Ben Ayed, H. Fourti and A. Selmi, Harmonic functions with nonlinear Neumann boundary condition and their Morse indices, Nonlinear Anal. Real World Appl., 38 (2017), 96-112. doi: 10.1016/j.nonrwa.2017.04.012. Google Scholar [4] H. Berestycki and P. L. Lions, Nonlinear scalar field equations, Part Ⅱ, Existence of infinitly many solutios groud, Ration. Mech. Anal., 82 (1982), 347-369. doi: 10.1007/BF00250556. Google Scholar [5] E. N. Dancer, Some notes on the method of moving planes, Bull. Austral. Math. Soc. angew. Math., 46 (1992), 425-434. doi: 10.1017/S0004972700012089. Google Scholar [6] J. Dávila, L. Dupaigne, K. Wang and J. Wei, A monotonicity formula and a Liouville-type theorem for a fourth order supercritical problem, Adv. Math., 258 (2014), 240-285. doi: 10.1016/j.aim.2014.02.034. Google Scholar [7] D. G. de Figueiredo and J. Yang, On a semilinear elliptic problem without (PS) condition, J. Differ. Equ., 187 (2003), 412-428. doi: 10.1016/S0022-0396(02)00055-4. Google Scholar [8] B. Devyver, On the finiteness of the Morse index for Schröinger operators, Manuscr. Math., 139 (2012), 249-271. doi: 10.1007/s00229-011-0522-1. Google Scholar [9] L. Dupaigne and A. Harrabi, The Lane-Emden Equation in Strips, Proc. R. Soc. Edinb. Sect. A Math., 148 (2018), 51-62. doi: 10.1017/S0308210517000142. Google Scholar [10] M. J. Esteban and P. L. Lions, Existence and nonexistence results for semilinear elliptic problems in unbounded domains, Proc. R. Soc. Edinb. Sect. A Math., 93 (1982), 1-14. doi: 10.1017/S0308210500031607. Google Scholar [11] A. Farina, On the classification of solutions of the Lane-Emden equation on unbounded domains of$ \mathbb{R}^N $, J. Math.Pures Appl., 87 (2007), 537-561. doi: 10.1016/j.matpur.2007.03.001. Google Scholar [12] B. Gidas and J. Spruck, A priori bounds for positive solutions of nonlinear elliptic equations, Commun. Partial Differ. Equ., 6 (1981), 883-901. doi: 10.1080/03605308108820196. Google Scholar [13] B. Gidas and J. Spruck, Global and local behavior of positive solutions of nonlinear elliptic equations, Commun. Pure Appl. Math., 34 (1981), 525-598. doi: 10.1002/cpa.3160340406. Google Scholar [14] D. Gilbarg et Neil S Trudinger, Elliptic Partial Differntial Equations of Second Order, Grundlehren Math. Wiss., Vol. 224, Springer-Verlag, New York, 1977. Google Scholar [15] A. Harrabi, M. Ahmadou, S. Rebhi and A. Selmi, A priori estimates for superlinear and subcritical elliptic equations: the Neumann boundary condition case, Manuscr. Math., 137 (2012), 525-544. doi: 10.1007/s00229-011-0488-z. Google Scholar [16] A. Harrabi and B. Rahal, On the sixth-order Joseph-Lundgren exponent, Ann. Henri Poincare, 18 (2017), 1055-1094. doi: 10.1007/s00023-016-0522-5. Google Scholar [17] A. Harrabi, B. Rahal, Liouville results for m-Laplace equations in half-space and strips with mixed boundary value conditions and Finite Morse index, J. Dyn. Differ. Equ., 30 (2018), 1161-1185. doi: 10.1007/s10884-017-9593-3. Google Scholar [18] A. Harrabi, S. Rebhi and A. Selmi, Solutions of superlinear equations and their Morse indices, Ⅰ, Duke. Math. J., 94 (1998), 141-157. doi: 10.1215/S0012-7094-98-09407-8. Google Scholar [19] A. Harrabi, S. Rebhi and A. Selmi, Solutions of superlinear equations and their Morse indices, Ⅱ, Duke. Math. J., 94 (1998), 159-179. doi: 10.1215/S0012-7094-98-09407-8. Google Scholar [20] W. F. Moss and J. Piepenbrink, Positive solutions of elliptic equations, Pac. J. Math., 75 (1978), 219-226. Google Scholar [21] M. Ramos and P. Rodrigues, On a fourth order superlinear elliptic problem, Electron. J. Differ. Equ. Conf., 06 (2001), 243-255. Google Scholar [22] M. Ramos, S. Terracini and C. Troestler, Superlinear indefinite elliptic problems and Phozaev type identities, J. Funct. Anal., 159 (1998), 596-628. doi: 10.1006/jfan.1998.3332. Google Scholar [23] F. Pacard, Partial regularity for weak solutions of a nonlinear elliptic equation, Manuscr. Math., 79 (1993), 161-172. doi: 10.1007/BF02568335. Google Scholar [24] S. I. Pohozaev, Eigenfunctions of$\Delta u+lf\left( u \right)=0$, Soviet Math. Dokl., 6 (1965), 1408-1411. Google Scholar [25] P. Polácik, P. Quittner and P. Souplet, Singularity and decay estimates in superlinear problems via Liouville-type theorems. Ⅰ. Elliptic equations and systems, Duke Math. J., 139 (2007), 555-579. doi: 10.1215/S0012-7094-07-13935-8. Google Scholar [26] S. Solimini, Morse index estimates in min-max theorems, Manuscr. Math., 63 (1989), 421-453. doi: 10.1007/BF01171757. Google Scholar [27] X. Wang, X. Zheng, Liouville theorem for elliptic equations with mixed boundary valu conditions and finite Morse indices, J. Inequal. Appl., (2015), 860–871. doi: 10.1186/s13660-015-0867-1. Google Scholar [28] X. Yu, Solution of mixed boundary problems and their Morse indices, Nonlinear Anal., 96 (2014), 146-153. doi: 10.1016/j.na.2013.11.011. Google Scholar [29] X. Yu, Liouville theorem for elliptic equations with nonlinear boundary value conditions and finite Morse indices, J. Math. Anal. Appl., 421 (2015), 436-443. doi: 10.1016/j.jmaa.2014.07.010. Google Scholar [30] X. Yu, Solution of fractional Laplacian equations and their Morse indices, J. Differ. Equ., 260 (2016), 860-871. doi: 10.1016/j.jde.2015.09.010. Google Scholar show all references ##### References:  [1] L. Ambrosio and X. Cabré, Entire solutions of semilinear elliptic equations in$ \mathbb{R}^3$and a conjecture of De Giorgi, J. Amer. Math. Soc., 13 (2000), 725-739. doi: 10.1090/S0894-0347-00-00345-3. Google Scholar [2] A. Bahri and P. L. Lions, Solutions of superlinear elliptic equations and their Morse indices, Commun. Pure. App. Math., 45 (1992), 1205-1215. doi: 10.1002/cpa.3160450908. Google Scholar [3] M. Ben Ayed, H. Fourti and A. Selmi, Harmonic functions with nonlinear Neumann boundary condition and their Morse indices, Nonlinear Anal. Real World Appl., 38 (2017), 96-112. doi: 10.1016/j.nonrwa.2017.04.012. Google Scholar [4] H. Berestycki and P. L. Lions, Nonlinear scalar field equations, Part Ⅱ, Existence of infinitly many solutios groud, Ration. Mech. Anal., 82 (1982), 347-369. doi: 10.1007/BF00250556. Google Scholar [5] E. N. Dancer, Some notes on the method of moving planes, Bull. Austral. Math. Soc. angew. Math., 46 (1992), 425-434. doi: 10.1017/S0004972700012089. Google Scholar [6] J. Dávila, L. Dupaigne, K. Wang and J. Wei, A monotonicity formula and a Liouville-type theorem for a fourth order supercritical problem, Adv. Math., 258 (2014), 240-285. doi: 10.1016/j.aim.2014.02.034. Google Scholar [7] D. G. de Figueiredo and J. Yang, On a semilinear elliptic problem without (PS) condition, J. Differ. Equ., 187 (2003), 412-428. doi: 10.1016/S0022-0396(02)00055-4. Google Scholar [8] B. Devyver, On the finiteness of the Morse index for Schröinger operators, Manuscr. Math., 139 (2012), 249-271. doi: 10.1007/s00229-011-0522-1. Google Scholar [9] L. Dupaigne and A. Harrabi, The Lane-Emden Equation in Strips, Proc. R. Soc. Edinb. Sect. A Math., 148 (2018), 51-62. doi: 10.1017/S0308210517000142. Google Scholar [10] M. J. Esteban and P. L. Lions, Existence and nonexistence results for semilinear elliptic problems in unbounded domains, Proc. R. Soc. Edinb. Sect. A Math., 93 (1982), 1-14. doi: 10.1017/S0308210500031607. Google Scholar [11] A. Farina, On the classification of solutions of the Lane-Emden equation on unbounded domains of$ \mathbb{R}^N $, J. Math.Pures Appl., 87 (2007), 537-561. doi: 10.1016/j.matpur.2007.03.001. Google Scholar [12] B. Gidas and J. Spruck, A priori bounds for positive solutions of nonlinear elliptic equations, Commun. Partial Differ. Equ., 6 (1981), 883-901. doi: 10.1080/03605308108820196. Google Scholar [13] B. Gidas and J. Spruck, Global and local behavior of positive solutions of nonlinear elliptic equations, Commun. Pure Appl. Math., 34 (1981), 525-598. doi: 10.1002/cpa.3160340406. Google Scholar [14] D. Gilbarg et Neil S Trudinger, Elliptic Partial Differntial Equations of Second Order, Grundlehren Math. Wiss., Vol. 224, Springer-Verlag, New York, 1977. Google Scholar [15] A. Harrabi, M. Ahmadou, S. Rebhi and A. Selmi, A priori estimates for superlinear and subcritical elliptic equations: the Neumann boundary condition case, Manuscr. Math., 137 (2012), 525-544. doi: 10.1007/s00229-011-0488-z. Google Scholar [16] A. Harrabi and B. Rahal, On the sixth-order Joseph-Lundgren exponent, Ann. Henri Poincare, 18 (2017), 1055-1094. doi: 10.1007/s00023-016-0522-5. Google Scholar [17] A. Harrabi, B. Rahal, Liouville results for m-Laplace equations in half-space and strips with mixed boundary value conditions and Finite Morse index, J. Dyn. Differ. Equ., 30 (2018), 1161-1185. doi: 10.1007/s10884-017-9593-3. Google Scholar [18] A. Harrabi, S. Rebhi and A. Selmi, Solutions of superlinear equations and their Morse indices, Ⅰ, Duke. Math. J., 94 (1998), 141-157. doi: 10.1215/S0012-7094-98-09407-8. Google Scholar [19] A. Harrabi, S. Rebhi and A. Selmi, Solutions of superlinear equations and their Morse indices, Ⅱ, Duke. Math. J., 94 (1998), 159-179. doi: 10.1215/S0012-7094-98-09407-8. Google Scholar [20] W. F. Moss and J. Piepenbrink, Positive solutions of elliptic equations, Pac. J. Math., 75 (1978), 219-226. Google Scholar [21] M. Ramos and P. Rodrigues, On a fourth order superlinear elliptic problem, Electron. J. Differ. Equ. Conf., 06 (2001), 243-255. Google Scholar [22] M. Ramos, S. Terracini and C. Troestler, Superlinear indefinite elliptic problems and Phozaev type identities, J. Funct. Anal., 159 (1998), 596-628. doi: 10.1006/jfan.1998.3332. Google Scholar [23] F. Pacard, Partial regularity for weak solutions of a nonlinear elliptic equation, Manuscr. Math., 79 (1993), 161-172. doi: 10.1007/BF02568335. Google Scholar [24] S. I. Pohozaev, Eigenfunctions of$\Delta u+lf\left( u \right)=0$, Soviet Math. Dokl., 6 (1965), 1408-1411. Google Scholar [25] P. Polácik, P. Quittner and P. Souplet, Singularity and decay estimates in superlinear problems via Liouville-type theorems. Ⅰ. Elliptic equations and systems, Duke Math. J., 139 (2007), 555-579. doi: 10.1215/S0012-7094-07-13935-8. Google Scholar [26] S. Solimini, Morse index estimates in min-max theorems, Manuscr. Math., 63 (1989), 421-453. doi: 10.1007/BF01171757. Google Scholar [27] X. Wang, X. Zheng, Liouville theorem for elliptic equations with mixed boundary valu conditions and finite Morse indices, J. Inequal. 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