# American Institute of Mathematical Sciences

July  2013, 18(5): 1345-1360. doi: 10.3934/dcdsb.2013.18.1345

## On the Mountain-Pass algorithm for the quasi-linear Schrödinger equation

 1 Université de Mons, Institut Complexys, Département de Mathématique, Service d'Analyse Numérique, Place du Parc, 20, B-7000 Mons, Belgium, Belgium 2 Dipartimento di Informatica, Università degli Studi di Verona, Cá Vignal 2, Strada Le Grazie 15, I-37134 Veron

Received  May 2012 Revised  December 2012 Published  March 2013

We discuss the application of the Mountain Pass Algorithm to the so-called quasi-linear Schrödinger equation, which is naturally associated with a class of nonsmooth functionals so that the classical algorithm cannot directly be used. A change of variable allows us to deal with the lack of regularity. We establish the convergence of a mountain pass algorithm in this setting. Some numerical experiments are also performed and lead to some conjectures.
Citation: Christopher Grumiau, Marco Squassina, Christophe Troestler. On the Mountain-Pass algorithm for the quasi-linear Schrödinger equation. Discrete & Continuous Dynamical Systems - B, 2013, 18 (5) : 1345-1360. doi: 10.3934/dcdsb.2013.18.1345
##### References:
 [1] A. Ambrosetti and Z.-Q. Wang, Positive solutions to a class of quasilinear elliptic equations on $\mathbbR$,, Disc. Cont. Dyna. Syst. - A, 9 (2003), 55. doi: 10.3934/dcds.2003.9.55. Google Scholar [2] M. Caliari and M. Squassina, Numerical computation of soliton dynamics for NLS equations in a driving potential,, Electron. J. Differential Equations, 89 (2010), 1. Google Scholar [3] M. Caliari and M. Squassina, On a bifurcation value related to quasi-linear Schrödinger equations,, J. Fixed Point Theory Appl., (). Google Scholar [4] Y. S. Choi and P. J. McKenna, A mountain pass method for the numerical solution of semilinear elliptic problems,, Nonlinear Anal., 20 (1993), 417. doi: 10.1016/0362-546X(93)90147-K. Google Scholar [5] M. Colin and L. Jeanjean, Solutions for a quasilinear Schrödinger equation: A dual approach,, Nonlinear Anal., 56 (2004), 213. doi: 10.1016/j.na.2003.09.008. Google Scholar [6] M. Colin, L. Jeanjean and M. Squassina, Stability and instability results for standing waves of quasi-linear Schrödinger equations,, Nonlinearity, 23 (2010), 1353. doi: 10.1088/0951-7715/23/6/006. Google Scholar [7] J.-N. Corvellec, M. Degiovanni and M. Marzocchi, Deformation properties for continuous functionals and critical point theory,, Topol. Methods Nonlinear Anal., 1 (1993), 151. Google Scholar [8] W. Y. Ding and W. M. Ni, On the existence of positive entire solutions of a semilinear elliptic equation,, Arch. Rational Mech. Anal., 91 (1986), 283. doi: 10.1007/BF00282336. Google Scholar [9] J. M. do Ó and U. Severo, Solitary waves for a class of quasilinear Schrödinger equations in dimension two,, Calculus of Variations, 38 (2010), 275. doi: 10.1007/s00526-009-0286-6. Google Scholar [10] B. Gidas, W. M. Ni and L. Nirenberg, Symmetry and related properties via the maximum principle,, Comm. Math. Phys., 68 (1979), 209. Google Scholar [11] F. Gladiali and M. Squassina, Uniqueness of ground states for a class of quasi-linear elliptic equations,, Adv. Nonlinear Anal., 1 (2012), 159. doi: 10.1515/ana-2011-0001. Google Scholar [12] E. Gloss, Existence and concentration of positive solutions for a quasilinear equation in $\mathbbR^N$,, J. Math. Anal. Appl., 371 (2010), 465. doi: 10.1016/j.jmaa.2010.05.033. Google Scholar [13] C. Grumiau and C. Troestler, Convergence of a mountain pass type algorithm for strongly indefinite problems and systems,, Preprint, (). Google Scholar [14] L. Jeanjean and K. Tanaka, A remark on least energy solutions in $\mathbbR^N$,, Proc. Amer. Math. Soc., 131 (2002), 2399. doi: 10.1090/S0002-9939-02-06821-1. Google Scholar [15] A. S. Lewis and C. H. J. Pang, Level set methods for finding critical points of mountain pass type,, Nonlinear Analysis, 74 (2011), 4058. doi: 10.1016/j.na.2011.03.039. Google Scholar [16] Y. Li and J. Zhou, A minimax method for finding multiple critical points and its applications to semilinear elliptic pde's,, SIAM Sci. Comp., 23 (2001), 840. doi: 10.1137/S1064827599365641. Google Scholar [17] Y. Li and J. Zhou, Convergence results of a local minimax method for finding multiple critical points,, SIAM Sci. Comp., 24 (2002), 865. doi: 10.1137/S1064827500379732. Google Scholar [18] E. Lieb, On the lowest eigenvalue of the Laplacian for the intersection of two domains,, Invent. Math., 74 (1983), 441. doi: 10.1007/BF01394245. Google Scholar [19] J. Q. Liu, Y. Q. Wang and Z. Q. Wang, Solutions for quasi-linear Schrödinger equations via the Nehari method,, Comm. Partial Differential Equations, 29 (2004), 879. doi: 10.1081/PDE-120037335. Google Scholar [20] P. Pucci and J. Serrin, "The Maximum Principle,", Progress in Nonlinear Differential Equations and Their Applications, 73 (2007). Google Scholar [21] J. R. Shewchuk, Delaunay refinement algorithms for triangular mesh generation,, Computational Geometry: Theory and Applications, 22 (2002), 21. doi: 10.1016/S0925-7721(01)00047-5. Google Scholar [22] A. Szulkin and T. Weth, Ground state solutions for some indefinite variational problems,, J. Funct. Anal., 257 (2009), 3802. doi: 10.1016/j.jfa.2009.09.013. Google Scholar [23] N. Tacheny and C. Troestler, A mountain pass algorithm with projector,, J. Comput. Appl. Math., 236 (2012), 2025. doi: 10.1016/j.cam.2011.11.011. Google Scholar [24] M. Willem, "Minimax Theorems,", Progress in Nonlinear Differential Equations and Their Applications, 24 (1996). doi: 10.1007/978-1-4612-4146-1. Google Scholar

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##### References:
 [1] A. Ambrosetti and Z.-Q. Wang, Positive solutions to a class of quasilinear elliptic equations on $\mathbbR$,, Disc. Cont. Dyna. Syst. - A, 9 (2003), 55. doi: 10.3934/dcds.2003.9.55. Google Scholar [2] M. Caliari and M. Squassina, Numerical computation of soliton dynamics for NLS equations in a driving potential,, Electron. J. Differential Equations, 89 (2010), 1. Google Scholar [3] M. Caliari and M. Squassina, On a bifurcation value related to quasi-linear Schrödinger equations,, J. Fixed Point Theory Appl., (). Google Scholar [4] Y. S. Choi and P. J. McKenna, A mountain pass method for the numerical solution of semilinear elliptic problems,, Nonlinear Anal., 20 (1993), 417. doi: 10.1016/0362-546X(93)90147-K. Google Scholar [5] M. Colin and L. Jeanjean, Solutions for a quasilinear Schrödinger equation: A dual approach,, Nonlinear Anal., 56 (2004), 213. doi: 10.1016/j.na.2003.09.008. Google Scholar [6] M. Colin, L. Jeanjean and M. Squassina, Stability and instability results for standing waves of quasi-linear Schrödinger equations,, Nonlinearity, 23 (2010), 1353. doi: 10.1088/0951-7715/23/6/006. Google Scholar [7] J.-N. Corvellec, M. Degiovanni and M. Marzocchi, Deformation properties for continuous functionals and critical point theory,, Topol. Methods Nonlinear Anal., 1 (1993), 151. Google Scholar [8] W. Y. Ding and W. M. Ni, On the existence of positive entire solutions of a semilinear elliptic equation,, Arch. Rational Mech. Anal., 91 (1986), 283. doi: 10.1007/BF00282336. Google Scholar [9] J. M. do Ó and U. Severo, Solitary waves for a class of quasilinear Schrödinger equations in dimension two,, Calculus of Variations, 38 (2010), 275. doi: 10.1007/s00526-009-0286-6. Google Scholar [10] B. Gidas, W. M. Ni and L. Nirenberg, Symmetry and related properties via the maximum principle,, Comm. Math. Phys., 68 (1979), 209. Google Scholar [11] F. Gladiali and M. Squassina, Uniqueness of ground states for a class of quasi-linear elliptic equations,, Adv. Nonlinear Anal., 1 (2012), 159. doi: 10.1515/ana-2011-0001. Google Scholar [12] E. Gloss, Existence and concentration of positive solutions for a quasilinear equation in $\mathbbR^N$,, J. Math. Anal. Appl., 371 (2010), 465. doi: 10.1016/j.jmaa.2010.05.033. Google Scholar [13] C. Grumiau and C. Troestler, Convergence of a mountain pass type algorithm for strongly indefinite problems and systems,, Preprint, (). Google Scholar [14] L. Jeanjean and K. Tanaka, A remark on least energy solutions in $\mathbbR^N$,, Proc. Amer. Math. Soc., 131 (2002), 2399. doi: 10.1090/S0002-9939-02-06821-1. Google Scholar [15] A. S. Lewis and C. H. J. Pang, Level set methods for finding critical points of mountain pass type,, Nonlinear Analysis, 74 (2011), 4058. doi: 10.1016/j.na.2011.03.039. Google Scholar [16] Y. Li and J. Zhou, A minimax method for finding multiple critical points and its applications to semilinear elliptic pde's,, SIAM Sci. Comp., 23 (2001), 840. doi: 10.1137/S1064827599365641. Google Scholar [17] Y. Li and J. Zhou, Convergence results of a local minimax method for finding multiple critical points,, SIAM Sci. Comp., 24 (2002), 865. doi: 10.1137/S1064827500379732. Google Scholar [18] E. Lieb, On the lowest eigenvalue of the Laplacian for the intersection of two domains,, Invent. Math., 74 (1983), 441. doi: 10.1007/BF01394245. Google Scholar [19] J. Q. Liu, Y. Q. Wang and Z. Q. Wang, Solutions for quasi-linear Schrödinger equations via the Nehari method,, Comm. Partial Differential Equations, 29 (2004), 879. doi: 10.1081/PDE-120037335. Google Scholar [20] P. Pucci and J. Serrin, "The Maximum Principle,", Progress in Nonlinear Differential Equations and Their Applications, 73 (2007). Google Scholar [21] J. R. Shewchuk, Delaunay refinement algorithms for triangular mesh generation,, Computational Geometry: Theory and Applications, 22 (2002), 21. doi: 10.1016/S0925-7721(01)00047-5. Google Scholar [22] A. Szulkin and T. Weth, Ground state solutions for some indefinite variational problems,, J. Funct. Anal., 257 (2009), 3802. doi: 10.1016/j.jfa.2009.09.013. Google Scholar [23] N. Tacheny and C. Troestler, A mountain pass algorithm with projector,, J. Comput. Appl. Math., 236 (2012), 2025. doi: 10.1016/j.cam.2011.11.011. Google Scholar [24] M. Willem, "Minimax Theorems,", Progress in Nonlinear Differential Equations and Their Applications, 24 (1996). doi: 10.1007/978-1-4612-4146-1. Google Scholar
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