Local smooth solutions to the Euler-Poisson equations for semiconductor in vacuum

IF 1.2 3区 数学 Q1 MATHEMATICS
La-Su Mai, Chun Wang
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引用次数: 0

Abstract

In this paper, we study the initial-boundary value problem to the Euler-Poisson equations for semiconductors, which involves the vacuum for the electronic density, a challenging case because of its degeneracy and singularity. The main issue is to investigate the local well-posedness of smooth solutions to the isentropic system with an adiabatic exponent γ>1, a degenerate hyperbolic-elliptic system on the free boundary. By setting the system to the Lagrangian coordinates, we reduce it to the quasi-linear wave equation coupling the Poisson equations, where the initial degeneracy can be explicitly expressed by the function ρ0γ1 of the initial density ρ0, which equals to the distance function near boundaries. By applying the Hardy inequality and weighted Sobolev spaces depending on the distance function, we can overcome the degeneracy and singularity of the system caused by the vacuum, and we technically establish some crucial priori estimates and then prove the existence and uniqueness of the local smooth solution. This is the first result on the smooth solution to the Euler-Poisson equations for semiconductors in vacuum.
真空中半导体欧拉-泊松方程的局部平稳解
本文研究了半导体欧拉-泊松方程的初始边界值问题,该问题涉及电子密度真空,由于其退化性和奇异性,这是一个具有挑战性的问题。主要问题是研究自由边界上具有绝热指数 γ>1 的等熵系统(一个退化的双曲-椭圆系统)的光滑解的局部好求解性。通过将系统设置为拉格朗日坐标,我们将其还原为与泊松方程耦合的准线性波方程,其中初始退化可以用初始密度 ρ0 的函数 ρ0γ-1 明确表示,它等于边界附近的距离函数。通过应用哈代不等式和取决于距离函数的加权索波列夫空间,我们可以克服真空导致的系统退化和奇异性,并从技术上建立了一些关键的先验估计,进而证明了局部光滑解的存在性和唯一性。这是关于真空中半导体欧拉-泊松方程光滑解的第一个结果。
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来源期刊
CiteScore
2.50
自引率
7.70%
发文量
790
审稿时长
6 months
期刊介绍: The Journal of Mathematical Analysis and Applications presents papers that treat mathematical analysis and its numerous applications. The journal emphasizes articles devoted to the mathematical treatment of questions arising in physics, chemistry, biology, and engineering, particularly those that stress analytical aspects and novel problems and their solutions. Papers are sought which employ one or more of the following areas of classical analysis: • Analytic number theory • Functional analysis and operator theory • Real and harmonic analysis • Complex analysis • Numerical analysis • Applied mathematics • Partial differential equations • Dynamical systems • Control and Optimization • Probability • Mathematical biology • Combinatorics • Mathematical physics.
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