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Search: MSC category 35Q55 ( NLS-like equations (nonlinear Schrodinger) [See also 37K10] )

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1. CMB 2016 (vol 59 pp. 542)

Jiang, Yongxin; Wang, Wei; Feng, Zhaosheng
 Spatial Homogenization of Stochastic Wave Equation with Large Interaction A dynamical approximation of a stochastic wave equation with large interaction is derived. A random invariant manifold is discussed. By a key linear transformation, the random invariant manifold is shown to be close to the random invariant manifold of a second-order stochastic ordinary differential equation. Keywords:stochastic wave equation, homogeneous system, approximation, random invariant manifold, Neumann boundary conditionCategories:60F10, 60H15, 35Q55

2. CMB 2015 (vol 58 pp. 471)

Demirbas, Seckin
 Almost Sure Global Well-posedness for the Fractional Cubic SchrÃ¶dinger Equation on Torus In a previous paper, we proved that $1$-d periodic fractional SchrÃ¶dinger equation with cubic nonlinearity is locally well-posed in $H^s$ for $s\gt \frac{1-\alpha}{2}$ and globally well-posed for $s\gt \frac{10\alpha-1}{12}$. In this paper we define an invariant probability measure $\mu$ on $H^s$ for $s\lt \alpha-\frac{1}{2}$, so that for any $\epsilon\gt 0$ there is a set $\Omega\subset H^s$ such that $\mu(\Omega^c)\lt \epsilon$ and the equation is globally well-posed for initial data in $\Omega$. We see that this fills the gap between the local well-posedness and the global well-posedness range in almost sure sense for $\frac{1-\alpha}{2}\lt \alpha-\frac{1}{2}$, i.e. $\alpha\gt \frac{2}{3}$ in almost sure sense. Keywords:NLS, fractional Schrodinger equation, almost sure global wellposednessCategory:35Q55

3. CMB 2011 (vol 56 pp. 378)

Ma, Li; Wang, Jing
 Sharp Threshold of the Gross-Pitaevskii Equation with Trapped Dipolar Quantum Gases In this paper, we consider the Gross-Pitaevskii equation for the trapped dipolar quantum gases. We obtain the sharp criterion for the global existence and finite time blow up in the unstable regime by constructing a variational problem and the so-called invariant manifold of the evolution flow. Keywords:Gross-Pitaevskii equation, sharp threshold, global existence, blow upCategories:35Q55, 35A05, 81Q99

4. CMB 2010 (vol 53 pp. 737)

Vougalter, Vitali
 On the Negative Index Theorem for the Linearized Non-Linear SchrÃ¶dinger Problem A new and elementary proof is given of the recent result of Cuccagna, Pelinovsky, and Vougalter based on the variational principle for the quadratic form of a self-adjoint operator. It is the negative index theorem for a linearized NLS operator in three dimensions. Categories:35Q55, 81Q10

5. CMB 2007 (vol 50 pp. 35)

Duyckaerts, Thomas
 A Singular Critical Potential for the SchrÃ¶dinger Operator Consider a real potential $V$ on $\RR^d$, $d\geq 2$, and the Schr\"odinger equation: $$\tag{LS} \label{LS1} i\partial_t u +\Delta u -Vu=0,\quad u_{\restriction t=0}=u_0\in L^2.$$ In this paper, we investigate the minimal local regularity of $V$ needed to get local in time dispersive estimates (such as local in time Strichartz estimates or local smoothing effect with gain of $1/2$ derivative) on solutions of \eqref{LS1}. Prior works show some dispersive properties when $V$ (small at infinity) is in $L^{d/2}$ or in spaces just a little larger but with a smallness condition on $V$ (or at least on its negative part). In this work, we prove the critical character of these results by constructing a positive potential $V$ which has compact support, bounded outside $0$ and of the order $(\log|x|)^2/|x|^2$ near $0$. The lack of dispersiveness comes from the existence of a sequence of quasimodes for the operator $P:=-\Delta+V$. The elementary construction of $V$ consists in sticking together concentrated, truncated potential wells near $0$. This yields a potential oscillating with infinite speed and amplitude at $0$, such that the operator $P$ admits a sequence of quasi-modes of polynomial order whose support concentrates on the pole. Categories:35B65, 35L05, 35Q40, 35Q55

6. CMB 2005 (vol 48 pp. 3)

Burq, N.
 Quantum Ergodicity of Boundary Values of Eigenfunctions: A Control Theory Approach Consider $M$, a bounded domain in ${\mathbb R}^d$, which is a Riemanian manifold with piecewise smooth boundary and suppose that the billiard associated to the geodesic flow reflecting on the boundary according to the laws of geometric optics is ergodic. We prove that the boundary value of the eigenfunctions of the Laplace operator with reasonable boundary conditions are asymptotically equidistributed in the boundary, extending previous results by G\'erard and Leichtnam as well as Hassell and Zelditch, obtained under the additional assumption of the convexity of~$M$. Categories:35Q55, 35BXX, 37K05, 37L50, 81Q20
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