Constrained Minimizers of the Fourth-Order Schrödinger Equation With Saturable Nonlinearity

IF 2.1 3区数学 Q1 MATHEMATICS, APPLIED

Mathematical Methods in the Applied Sciences Pub Date : 2025-01-06 DOI:10.1002/mma.10685

Zeye Han

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引用次数: 0

Abstract

In this paper, we consider the existence of normalized solutions for the following fourth-order Schrödinger equation with saturated nonlinearity: $(\begin{matrix} Δ^{2} u - Δ u + λ u = μ \frac{I (x) + u^{2}}{1 + I (x) + u^{2}} u, x \in ℝ^{N} \\ \int_{ℝ^{N}} | u |^{2} d x = a^{2} \end{matrix})$ , where $N \geq 2, λ \in ℝ, μ > 0$ , and $I (x) \in C (ℝ^{N}, ℝ)$ is a bounded function. We prove that there exists $μ_{1} > 0$ , such that the fourth-order Schrödinger equation admits a radial ground-state normalized solution $(ū, \overline{λ})$ if $μ > μ_{1}$ . Furthermore, we obtain that the estimates of upper bound for the ground-state energy and the upper and lower bounds for the Lagrange multiplier $\overline{λ}$ .

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来源期刊

Mathematical Methods in the Applied Sciences 数学-应用数学

CiteScore

4.90

自引率

6.90%

发文量

798

审稿时长

6 months

期刊介绍： Mathematical Methods in the Applied Sciences publishes papers dealing with new mathematical methods for the consideration of linear and non-linear, direct and inverse problems for physical relevant processes over time- and space- varying media under certain initial, boundary, transition conditions etc. Papers dealing with biomathematical content, population dynamics and network problems are most welcome. Mathematical Methods in the Applied Sciences is an interdisciplinary journal: therefore, all manuscripts must be written to be accessible to a broad scientific but mathematically advanced audience. All papers must contain carefully written introduction and conclusion sections, which should include a clear exposition of the underlying scientific problem, a summary of the mathematical results and the tools used in deriving the results. Furthermore, the scientific importance of the manuscript and its conclusions should be made clear. Papers dealing with numerical processes or which contain only the application of well established methods will not be accepted. Because of the broad scope of the journal, authors should minimize the use of technical jargon from their subfield in order to increase the accessibility of their paper and appeal to a wider readership. If technical terms are necessary, authors should define them clearly so that the main ideas are understandable also to readers not working in the same subfield.