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Fractional interpolation inequality and radially symmetric ground states

Part of: General mathematical topics and methods in quantum theory Linear function spaces and their duals Partial differential equations Miscellaneous topics - Partial differential equations

Published online by Cambridge University Press:  12 May 2022

Li Ma  and
Fangyuan Dong
Li Ma
Affiliation:
School of Mathematics and Physics, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China (lma17@ustb.edu.cn,dfangyuan20@163.com)
Fangyuan Dong
Affiliation:
School of Mathematics and Physics, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China (lma17@ustb.edu.cn,dfangyuan20@163.com)
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Abstract

In this paper, we establish a new fractional interpolation inequality for radially symmetric measurable functions on the whole space $R^{N}$ and a new compact imbedding result about radially symmetric measurable functions. We show that the best constant in the new interpolation inequality can be achieved by a radially symmetric function. As applications of this compactness result, we study the existence of ground states of the nonlinear fractional Schrödinger equation on the whole space $R^{N}$. We also prove an existence result of standing waves and prove their orbital stability.

Keywords

Interpolation inequalityfractional Laplaciancompactness resultground statesstanding waves

MSC classification

Primary: 35R11: Fractional partial differential equations
Secondary: 46E35: Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems 35B65: Smoothness and regularity of solutions 81Q05: Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 153 , Issue 3 , June 2023 , pp. 937 - 957
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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