# American Institute of Mathematical Sciences

March  2012, 11(2): 587-626. doi: 10.3934/cpaa.2012.11.587

## The non-linear Schrödinger equation with non-periodic potential: infinite-bump solutions and non-degeneracy

 1 University Science Institute, University of Iceland, Dunhaga 3, 107--Reykjavik, Iceland 2 Reykjavik Junior College, Lækjargata 7, 101--Reykjavik, Iceland

Received  September 2010 Revised  January 2011 Published  October 2011

The equation $-\varepsilon^2 \Delta u+F(V(x),u)=0$ is considered in $R^n$. It is assumed that $V$ possesses a set of critical points $B$ for which the values of $V$ and $D^2V$ satisfy certain compactness and uniformity properties. Under appropriate conditions on $F$ the problem is shown to possess for each $b\in B$ and small $\varepsilon>0$ a solution that concentrates at $b$ and has detailed uniformity and decay properties. This enables the construction of solutions that concentrate at arbitrary subsets of $B$ as $\varepsilon\to 0$. Examples are given in which $B$ is infinite and $V$ non-periodic.
Citation: Robert Magnus, Olivier Moschetta. The non-linear Schrödinger equation with non-periodic potential: infinite-bump solutions and non-degeneracy. Communications on Pure & Applied Analysis, 2012, 11 (2) : 587-626. doi: 10.3934/cpaa.2012.11.587
##### References:
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##### References:
 [1] N. Ackermann, A nonlinear superposition principle and multibump solutions of periodic Schrödinger equations,, J. Funct. Analysis, 234 (2006), 277.  doi: 10.1016/j.jfa.2005.11.010.  Google Scholar [2] S. Angenent, The shadowing lemma for elliptic PDE,, in, (1987), 7.   Google Scholar [3] V. Coti Zelati and P. H. Rabinowitz, Homoclinic type solutions for a semilinear elliptic PDE on $\R^n$,, Comm. Pure. Appl. Math., 45 (1992), 1217.  doi: 10.1002/cpa.3160451002.  Google Scholar [4] A. Floer and A. Weinstein, Nonspreading wave packets for the cubic Schrödinger equation with a bounded potential,, J. Funct. Analysis, 69 (1986), 397.  doi: 10.1016/0022-1236(86)90096-0.  Google Scholar [5] C. Gui, Existence of multi-bump solutions for non-linear Schrödinger equations via variational method,, Comm. in PDE, 21 (1996), 787.  doi: 10.1080/03605309608821208.  Google Scholar [6] M. K. Kwong, Uniqueness of positive solutions of $\Delta u-u+u^p=0$ in $\R^n$,, Arch. Rational Mech. Anal., 105 (1989), 243.  doi: 10.1007/BF00251502.  Google Scholar [7] R. Magnus, The implicit function theorem and multibump solutions of periodic partial differential equations,, Proceedings of the Royal Society of Edinburgh, 136A (2006), 559.  doi: 10.1017/S0308210500005060.  Google Scholar [8] R. Magnus, A scaling approach to bumps and multi-bumps for nonlinear partial differential equations,, Proceedings of the Royal Society of Edinburgh, 136A (2006), 585.  doi: 10.1017/S0308210500005072.  Google Scholar [9] R. Magnus and O. Moschetta, Non-degeneracy of perturbed solutions of semilinear partial differential equations,, Ann. Aca. Scient. Fennicae, 35 (2010), 75.  doi: 10.5186/aasfm.2010.3505.  Google Scholar [10] O. Moschetta, "The Non-linear Schrödinger Equation: Non-degeneracy and Infinite-bump Solutions,", Ph.D thesis, (2010).   Google Scholar [11] Y. G. Oh, Existence of semi-classical bound states of nonlinear Schrödinger equations with potentials of the class $(V)_a$,, Commun. Partial Diff. Eq., 13 (1988), 1499.  doi: 10.1080/03605308808820585.  Google Scholar [12] Y. G. Oh, On positive multi-lump bound states of nonlinear Schrödinger equations under multiple well potential,, Comm. Math. Phys., 131 (1990), 223.  doi: 10.1007/BF02161413.  Google Scholar [13] J. M. Ortega, The Newton-Kantorovich theorem,, Amer. Math. Monthly, 75 (1968), 658.  doi: 10.2307/2313800.  Google Scholar [14] M. del Pino and P. Felmer, Multi-peak bound states for nonlinear Schrödinger equations,, Ann. Inst. H. Poincar\'e, 15 (1998), 127.   Google Scholar [15] M. del Pino and P. Felmer, Semi-classical states of nonlinear Schrödinger equations: a variational reduction method,, Math. Ann., 324 (2002), 1.  doi: 10.1007/s002080200327.  Google Scholar [16] M. del Pino, P. Felmer and K. Tanaka, An elementary construction of complex patterns in nonlinear Schrödinger equations,, Nonlinearity, 15 (2002), 1653.   Google Scholar [17] P. Rabier and C. Stuart, Exponential decay of the solutions of quasilinear second-order equations and Pohozaev identities,, Journal of Differential Equations, 165 (2000), 199.  doi: 10.1006/jdeq.1999.3749.  Google Scholar [18] L. Schwartz, "Théorie des distributions,", Hermann, (1966).   Google Scholar [19] C. Stuart, An introduction to elliptic equations in $\R^n$,, in, (1998), 237.   Google Scholar [20] N. Thandi, "On the Existence of Infinite Bump Solutions of Nonlinear Schrödinger Equations with Periodic Potentials,", Ph.D thesis, (1995).   Google Scholar [21] J-L. Verger-Gaugry, Covering a ball with smaller equal balls in $\mathbbR^n$,, Discrete and Computational Geometry, 33 (2005), 143.  doi: 10.1007/s00454-004-2916-2.  Google Scholar [22] X. Wang, On concentration of positive bound states of nonlinear Schrödinger equations,, Comm. Math. Phys., 153 (1993), 229.  doi: 10.1007/BF02096642.  Google Scholar [23] M. Weinstein, Modulational stability of the ground states of nonlinear Schrödinger equations,, SIAM J. Math. Anal., 16 (1985), 567.   Google Scholar
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