高阶Schr(O)dinger方程的加权估计

本文主要研究的是相函数为齐次椭圆多项式的自由高阶Schrodinger方程.通过相函数等值面的几何性质,得到了解算子的Strichartz加权估计和极大算子加权估计.     

高阶Schrdinger方程的加权估计

本文主要研究的是相函数为齐次椭圆多项式的自由高阶 Schrdinger 方程．通过相函数等值面的几何性质,得到了解算子的 Strichartz 加权估计和极大算子加权估计．     

广义混合非线性Schrödinger方程的拟谱方法

本文讨论了广义混合非线性Schrodinger方程的周期初值问题,构造了守恒的半离散Fourier拟谱格式,对其近似解进行了先验估计,并证明了格式的收敛性.证明了该方程存在孤立子解,并给出其孤立子解的精确表达式.研究了线性化方程的稳定性问题,即在初值有扰动的情况下,该方程只有振荡解和鞍点.最后,通过数值例子验证了格式的可信性,数值计算表明,本格式时间方向可取大步长且是长时间稳定的,我们还计算了孤立子解,并绘出了在初值有扰动的情况下,相空间的轨线图.     

一般非线性Schrödinger方程的显式孤立波解

本文考虑推广的导数非线性Schrodinger方程;运用动力系统的几何理论、分支理论和直接方法,得到其指定形式的所有显式精确孤立波解.本文的结果包含和推广了关于这一方程的显式精确孤立波解的所有已知结果.     

高阶非线性Schrödinger方程的整体适定性

本文研究了一类非线性高阶Schr(o)dinger方程Cauchy问题的整体适定性.利用不动点定理,获得了整体解的存在唯一性及解关于初值的连续依赖性和解具有较强的衰减估计.推广了文献[4]中的结果.     

高阶波动方程的时空估计与低能量散射

本文研究了高阶波动方程的低能量散射理论，基本工具是高阶线性波动方程解的时空估计．与经典的二阶波动方程解的时空估计证明不同，我们采用泛函分析的方法与待定指标技巧，首次给出了高阶线性波动方程的时空估计，藉此与非线性函数在齐次Ｓｏｂｏｌｅｖ空间中的估计，获得了高阶波动方程的低能量散射结论．与此同时，也得到了具临界增长的高阶波动方程的柯西问题在低能量条件下的整体存在唯一性．     

平面负位势相关的Schrödinger方程的非负广义解

设β是复平面上圆盘Ωa={z ||z|＜a}内的一个零容紧致集.考虑Ωβα=Ωα\β上的定常Schrodinger方程(-A+μ)u=0,其中位势μ≤0是Kato类Radon测度.将方程在广义函数意义下的在{z||z|=a}上取极限值0的非负连续解族记为μH+.对Ωβα的Kerekjato-Stoilow意义下的理想边界β的任一点ζ,本文通过定义μH+→μH+的线性算子πζ,引入Martin函数Kζ,证明了μH+=Hβ Pβ,其中Hβ={u∈μH+|πζ(u)=0,vζβ},Pβ={u∈μH+|u=∞∑i=i ciKζi,ζi∈β,ci≥0}.     

多线性Calder(o)n-Zygmund算子的加权估计

本文建立由Grafakos和Torrea引进的多线性Calder(o)n-Zygmund算子相关极大算子的加权Lp(RN)估计和弱端点估计.     

高阶Schrodinger方程的差分格式

高阶Ｓｃｈｒｏｄｉｎｇｅｒ方程的差分格式曾文平（泉州华侨大学应用数学系泉州３６２０ｉｆ）关键词：显式差分格式；稳定性分析；高阶Ｓｃｈｒｏｄｉｎｇｅｒ方程ＡＭＳ（１９９１）主题分类：６５Ｍ０６，６５Ｍ１２．高阶Ｓｃｈｒｓｄｉｎｇｅｒ方程在量子力学、非线...     

一类奇异积分算子在加权空间的界的估计

设T是由Grubb和Moore引入的一类奇异积分算子,它的核满足一种新型利普希茨正则性.T*是由T确定的极大奇异积分算子.本文通过建立与T和T*相关的grand极大算子的弱型端点估计,得到了算子T和T*在加权空间的由Ap权常数表示的界的估计和弱型端点估计.     

Upper Estimates for a Moving Boundary Problem for Resonant Nonlinear Schrödinger Equations

Pointwise bounds are obtained for the solution of an initial boundary value problem for the resonant nonlinear Schrödinger equations. The context is that of a straight-line region with prescribed moving boundaries, expanding or noncontracting, upon which zero (Dirichlet) conditions are imposed.     

Estimates for multiparameter maximal operators of Schrödinger type

Multiparameter maximal estimates are considered for operators of Schrödinger type. Sharp and almost sharp results, that extend work by Rogers and Villarroya, are obtained. We provide new estimates via the integrability of the kernel which naturally appears with a TT^?$T{T}^{?}$ argument and discuss the behavior at the endpoints. We treat in particular the case of global integrability of the maximal operator on finite time for solutions to the linear Schrödinger equation and make some comments on an open problem.     

耦合非线性Schrödinger方程组的Neumann问题

该文考虑一类耦合椭圆型非线性Schr\"{o}dinger方程组的Neumann问题极小能量解（基态解）的存在性和集中性质. 主要研究极小能量解的尖点, 即最大值点的位置. 利用 Lin Tai-Chia 和 Wei Juncheng 研究 Dirichlet 问题的方法, 该文首先得到了相应Neumann问题的极小能量解的存在性. 当相当于Planck常数的小参数趋于零时, 该文证明了极小能量解的尖点向定义区域的边界靠近, 并且能量集中在这些尖点处. 另外, 方程组解的两个分支解相互吸引或排斥时, 它们的尖点也相互吸引或排斥.     

Discretization of Coupled Nonlinear Schrödinger Equations

The soliton solutions for discrete coupled nonlinear Schrödinger equations are investigated by using bilinear formalism. Pfaffian expressions of the N -soliton solutions of dark–dark and bright–bright types are explicitly given for the defocusing–defocusing and focusing–focusing cases, respectively.     

Cauchy Problem for Evolution Equations of Schrödinger Type

In (R. Agliardi, 1995, Internat. J. Math.6, 791-804) we proved the well-posedness of the Cauchy problem in H^∞ for some p-evolution equations (p?1) with real characteristic roots. For this purpose some assumptions on the lower order terms are needed, which, in the special case p=1, recapture well-known results for hyperbolic operators. In (R. Agliardi, 1995, Internat. J. Math.6, 791-804) the leading coefficients are assumed to be constant. In this paper we allow them to be variable. Our result is applicable to 2-evolution differential operators with real characteristics, i.e., to Schrödinger type operators. This class of operators comprehends, for example, Schrödinger operator D_t−Δ_x or the plate operator D²_t−Δ²_x. The Cauchy problem in H^∞ for such evolution operators has been studied extensively by Takeuchi when the coefficients in the principal part are constant and the characteristic roots are distinct.     

New Integrable Equations of Nonlinear Schrödinger Type

New integrable matrix nonlinear evolution partial differential equations in (1 + 1)-dimensions are derived, via a treatment which starts from an appropriate matrix generalization of the Zakharov–Shabat spectral problem. Via appropriate parametrizations, multi-vector versions of these equations are also exhibited. Generally these equations feature solitons that do not move with constant velocities: they rather behave as boomerons or as trappons, namely, up to a Galileian transformation, they typically boomerang back to where they came from, or they are trapped to oscillate around some fixed position determined by their initial data. In this paper, meant to be the first of a series, we focus on the derivation and exhibition of new coupled evolution equations of nonlinear Schrödinger type and on the behavior of their single-soliton solutions.     

Estimates for fundamental solutions and spectral bounds for a class of Schrödinger operators

We study a class of Schrödinger operators of the form , where is a nonnegative function singular at 0, that is V(0)=0. Under suitable assumptions on the potential V, we derive sharp lower and upper bounds for the fundamental solution hε. Moreover, we obtain information on the spectrum of the self-adjoint operator defined by Lε in L²(R). In particular, we give a lower bound for the eigenvalues.     

Weighted estimates for commutators of some singular integrals related to Schrödinger operators

Let L=−Δ+V$L=-\mathrm{\Delta }+V$ be a Schrödinger operator with a non-negative potential V satisfying some appropriate reverse Hölder inequality. In this paper, we study the boundedness of the commutators of some singular integrals associated to L such as the Riesz transforms and fractional integrals with the new BMO functions introduced in Bongioanni et al. (2011) [1] on the weighted spaces L^p(w)$L^p(w)$ where w belongs to the new classes of weights introduced by Bongioanni et al. (2011) [2].