ISSN:
1572-9656
Keywords:
Davey–Stewartson system
;
Ishimori system
;
elliptic–hyperbolic case
;
nonlocal nonlinear Schrödinger equation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
,
Physics
Notes:
Abstract We study the initial value problem for the two-dimensional nonlinear nonlocal Schrödinger equations i ut + Δ u = N(v), (t, x, y) ∈ R3, u(0, x, y) = u0(x, y), (x, y) ∈ R2 (A), where the Laplacian Δ = ∂2 x + ∂2 y, the solution u is a complex valued function, the nonlinear term N = N1 + N2 consists of the local nonlinear part N1(v) which is cubic with respect to the vector v=(u,ux,uy,\overline{u},\overline{u}_{x},\overline{u}_{y}) in the neighborhood of the origin, and the nonlocal nonlinear part N2(v) =(v, ∂ − 1 x Kx(v)) + (v, ∂− 1 y Ky(v)), where (⋅, ⋅) denotes the inner product, $$\partial _x^{ - 1} = \int_{ - \infty }^x {{\text{d}}x',} \partial _y^{ - 1} = \int_{ - \infty }^x {{\text{d}}x',} $$ and the vectors Kx ∈(C4(C6; C))6 and Ky ∈(C4(C6; C))6 are quadratic with respect to the vector v in the neighborhood of the origin. We assume that the components K(2) x = K(4) x ≡ 0, K(3) y = K(6) y ≡ 0. In particular, Equation (A) includes two physical examples appearing in fluid dynamics. The elliptic–hyperbolic Davey–Stewartson system can be reduced to Equation (A) with $$\mathcal{N}_1 = \left| u \right|^2 u,\mathcal{K}_x^{\left( 1 \right)} = \partial _y \left( {\left| u \right|^2 } \right),\mathcal{K}_y^{\left( 1 \right)} = \partial _x \left( {\left| u \right|^2 } \right)$$ , and all the rest components of the vectors Kx and Ky are equal to zero. The elliptic–hyperbolic Ishimori system is involved in Equation (A), when $$\mathcal{N}_1 = \left( {1 + \left| u \right|^2 } \right)^{ - 1} \bar u\left({\nabla u} \right)^2 $$ , and $$\mathcal{K}_y^{\left( 3 \right)} = - \mathcal{K}_y^{\left( 2 \right)} \left( {1 + \left| \right|^2 } \right)^{ - 2} \left( {u_x \bar u_y - \bar u_x u_y } \right)$$ . Our purpose in this paper is to prove the local existence in time of small solutions to the Cauchy problem (A) in the usual Sobolev space, and the global-in-time existence of small solutions to the Cauchy problem (A) in the weighted Sobolev space under some conditions on the complex conjugate structure of the nonlinear terms, namely if N(ei θ v) = ei θ N(v) for all θ ∈ R.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1009875019021
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