# American Institute of Mathematical Sciences

September  2011, 31(3): 997-1015. doi: 10.3934/dcds.2011.31.997

## Almost periodic solutions for a class of semilinear quantum harmonic oscillators

 1 Department of Mathematics, Nanjing University, Nanjing 210093, China, China

Received  June 2010 Revised  October 2010 Published  August 2011

In this paper, we show that there are many almost periodic solutions corresponding to full dimensional invariant tori for the semilinear quantum harmonic oscillators with Hermite multiplier $${\rm i}{u}_{t}-u_{xx}+x^2u + M_\xi u+\varepsilon |u|^{2m}u=0,\quad u\in C^1(\Bbb R,L^2(\Bbb R)),$$ where $m \geq 1$ is an integer. The proof is based on an abstract infinite dimensional KAM theorem.
Citation: Jian Wu, Jiansheng Geng. Almost periodic solutions for a class of semilinear quantum harmonic oscillators. Discrete and Continuous Dynamical Systems, 2011, 31 (3) : 997-1015. doi: 10.3934/dcds.2011.31.997
##### References:
 [1] J. Bourgain, Quasi-periodic solutions of Hamiltonian perturbations of 2D linear Schrödinger equations, Annals of Mathematics, 148 (1998), 363-439. doi: 10.2307/121001. [2] J. Bourgain, Construction of periodic solutions of nonlinear wave equations in higher dimension, Geom. Funct. Anal., 5 (1995), 629-639. doi: 10.1007/BF01902055. [3] J. Bourgain, Construction of quasi-periodic solutions for Hamiltonian perturbations of linear equations and applications to nonlinear PDE, International Mathematics Research Notices, 1994, 475ff., approx. 21 pp. [4] J. Bourgain, Construction of approximative and almost periodic solutions of perturbed linear Schrödinger and wave equations, Geom. Funct. Anal., 6 (1996), 201-230. doi: 10.1007/BF02247885. [5] J. Bourgain, On invariant tori of full dimension for 1D periodic NLS, J. Funct. Anal., 229 (2005), 62-94. doi: 10.1016/j.jfa.2004.10.019. [6] W. Craig and C. E. Wayne, Newton's method and periodic solutions of nonlinear wave equations, Comm. Pure. Appl. Math., 46 (1993), 1409-1498. doi: 10.1002/cpa.3160461102. [7] J. Geng and J. You, KAM tori of Hamiltonian perturbations of 1D linear beam equations, J. Math. Anal. Appl., 277 (2003), 104-121. doi: 10.1016/S0022-247X(02)00505-X. [8] J. Geng and J. You, A KAM theorem for Hamiltonian partial differential equations in higher dimensional spaces, Commun. Math. Phys., 262 (2006), 343-372. doi: 10.1007/s00220-005-1497-0. [9] B. Grébert and L. Thomann, KAM for the quantum harmonic oscillator,, preprint, (). [10] S. B. Kuksin, "Nearly Integrable Infinite Dimensional Hamiltonian Systems," Lecture Notes in Mathematics, 1556, Springer-Verlag, Berlin, 1993. [11] S. B. Kuksin and J. Pöschel, Invariant Cantor manifolds of quasi-periodic oscillations for a nonlinear Schrödinger equation, Ann. Math., 143 (1996), 149-179. doi: 10.2307/2118656. [12] H. Niu and J. Geng, Almost periodic solutions for a class of higher dimensional beam equations, Nonlinearity, 20 (2007), 2499-2517. doi: 10.1088/0951-7715/20/11/003. [13] J. Pöschel, A KAM theorem for some nonlinear partial differential equations, Ann. Sc. Norm. sup. Pisa CI. Sci., 23 (1996), 119-148. [14] J. Pöschel, Quasi-periodic solutions for a nonlinear wave equation, Comment. Math. Helvetici., 71 (1993), 269-296. [15] J. Pöschel, On the construction of almost periodic solutions for a nonlinear Schrödinger equations, Ergod. Th. and Dynam. Syst., 22 (2002), 1537-1549. [16] K. Yajima and G. Zhang, Smoothing property for Schrödinger equations with potential superquadratic at infinity, Commun. Math. Phys., 221 (2001), 573-590. doi: 10.1007/s002200100483.

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##### References:
 [1] J. Bourgain, Quasi-periodic solutions of Hamiltonian perturbations of 2D linear Schrödinger equations, Annals of Mathematics, 148 (1998), 363-439. doi: 10.2307/121001. [2] J. Bourgain, Construction of periodic solutions of nonlinear wave equations in higher dimension, Geom. Funct. Anal., 5 (1995), 629-639. doi: 10.1007/BF01902055. [3] J. Bourgain, Construction of quasi-periodic solutions for Hamiltonian perturbations of linear equations and applications to nonlinear PDE, International Mathematics Research Notices, 1994, 475ff., approx. 21 pp. [4] J. Bourgain, Construction of approximative and almost periodic solutions of perturbed linear Schrödinger and wave equations, Geom. Funct. Anal., 6 (1996), 201-230. doi: 10.1007/BF02247885. [5] J. Bourgain, On invariant tori of full dimension for 1D periodic NLS, J. Funct. Anal., 229 (2005), 62-94. doi: 10.1016/j.jfa.2004.10.019. [6] W. Craig and C. E. Wayne, Newton's method and periodic solutions of nonlinear wave equations, Comm. Pure. Appl. Math., 46 (1993), 1409-1498. doi: 10.1002/cpa.3160461102. [7] J. Geng and J. You, KAM tori of Hamiltonian perturbations of 1D linear beam equations, J. Math. Anal. Appl., 277 (2003), 104-121. doi: 10.1016/S0022-247X(02)00505-X. [8] J. Geng and J. You, A KAM theorem for Hamiltonian partial differential equations in higher dimensional spaces, Commun. Math. Phys., 262 (2006), 343-372. doi: 10.1007/s00220-005-1497-0. [9] B. Grébert and L. Thomann, KAM for the quantum harmonic oscillator,, preprint, (). [10] S. B. Kuksin, "Nearly Integrable Infinite Dimensional Hamiltonian Systems," Lecture Notes in Mathematics, 1556, Springer-Verlag, Berlin, 1993. [11] S. B. Kuksin and J. Pöschel, Invariant Cantor manifolds of quasi-periodic oscillations for a nonlinear Schrödinger equation, Ann. Math., 143 (1996), 149-179. doi: 10.2307/2118656. [12] H. Niu and J. Geng, Almost periodic solutions for a class of higher dimensional beam equations, Nonlinearity, 20 (2007), 2499-2517. doi: 10.1088/0951-7715/20/11/003. [13] J. Pöschel, A KAM theorem for some nonlinear partial differential equations, Ann. Sc. Norm. sup. Pisa CI. Sci., 23 (1996), 119-148. [14] J. Pöschel, Quasi-periodic solutions for a nonlinear wave equation, Comment. Math. Helvetici., 71 (1993), 269-296. [15] J. Pöschel, On the construction of almost periodic solutions for a nonlinear Schrödinger equations, Ergod. Th. and Dynam. Syst., 22 (2002), 1537-1549. [16] K. Yajima and G. Zhang, Smoothing property for Schrödinger equations with potential superquadratic at infinity, Commun. Math. Phys., 221 (2001), 573-590. doi: 10.1007/s002200100483.
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