Global well-posedness and scattering of the four dimensional cubic focusing nonlinear Schrödinger system

Yonghang Chang; Menglan Liao; Yonghang Chang; Menglan Liao

doi:10.3934/math.20241254

AIMS Mathematics

2024, Volume 9, Issue 9: 25659-25688. doi: 10.3934/math.20241254

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Research article

Global well-posedness and scattering of the four dimensional cubic focusing nonlinear Schrödinger system

Yonghang Chang ,
Menglan Liao ^,

School of Mathematics, Hohai University, Nanjing 210098, China

Received: 05 July 2024 Revised: 09 August 2024 Accepted: 16 August 2024 Published: 04 September 2024
MSC : 35A15, 35B15, 35P25, 35Q55

In this paper, the Cauchy problem for a class of coupled system of the four-dimensional cubic focusing nonlinear Schrödinger equations was investigated. By exploiting the double Duhamel method and the long-time Strichartz estimate, the global well-posedness and scattering were proven for the system below the ground state. In our proof, we first established the variational characterization of the ground state, and obtained the threshold of the global well-posedness and scattering. Second, we showed that the non-scattering is equivalent to the existence of an almost periodic solution by following the concentration-compactness/rigidity arguments of Kenig and Merle ^[17] (Invent. Math., 166 (2006), 645–675). Then, we obtained the global well-posedness and scattering below the threshold by excluding the almost periodic solution.
- nonlinear Schrödinger system,
- global well-posedness,
- ground state,
- scattering,
- almost periodic solution
Citation: Yonghang Chang, Menglan Liao. Global well-posedness and scattering of the four dimensional cubic focusing nonlinear Schrödinger system[J]. AIMS Mathematics, 2024, 9(9): 25659-25688. doi: 10.3934/math.20241254

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Abstract

In this paper, the Cauchy problem for a class of coupled system of the four-dimensional cubic focusing nonlinear Schrödinger equations was investigated. By exploiting the double Duhamel method and the long-time Strichartz estimate, the global well-posedness and scattering were proven for the system below the ground state. In our proof, we first established the variational characterization of the ground state, and obtained the threshold of the global well-posedness and scattering. Second, we showed that the non-scattering is equivalent to the existence of an almost periodic solution by following the concentration-compactness/rigidity arguments of Kenig and Merle ^[17] (Invent. Math., 166 (2006), 645–675). Then, we obtained the global well-posedness and scattering below the threshold by excluding the almost periodic solution.

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