Abstract:In a recent paper [18], Kenig, Ponce and Vega study the low regularity behavior of the focusing nonlinear Schrödinger (NLS), focusing modified Korteweg-de Vries (mKdV), and complex Korteweg-de Vries (KdV) equations. Using soliton and breather solutions, they demonstrate the lack of local well-posedness for these equations below their respective endpoint regularities.In this paper, we study the defocusing analogues of these equations, namely defocusing NLS, defocusing mKdV, and real KdV, all in one spatial dime… Show more
“…In this paper, we prove GWP for k = 0, s = − 1 2 , using a scheme based on mass conservation (1.2) and subcritical slack in certain multilinear estimates at this regularity threshold. In [12], it is shown that the onedimensional LWP theory of [11] is effectively sharp by adapting techniques of [5] and [7]. Thus, we establish GWP in the largest space for which LWP holds.…”
Abstract. We prove low regularity global well-posedness for the 1d Zakharov system and the 3d Klein-Gordon-Schrödinger system, which are systems in two variables u :The Zakharov system is known to be locally well-posed in (u, n) ∈ L 2 × H −1/2 and the Klein-GordonSchrödinger system is known to be locally well-posed in (u, n) ∈ L 2 ×L 2 . Here, we show that the Zakharov and Klein-Gordon-Schrödinger systems are globally well-posed in these spaces, respectively, by using an available conservation law for the L 2 norm of u and controlling the growth of n via the estimates in the local theory.
“…In this paper, we prove GWP for k = 0, s = − 1 2 , using a scheme based on mass conservation (1.2) and subcritical slack in certain multilinear estimates at this regularity threshold. In [12], it is shown that the onedimensional LWP theory of [11] is effectively sharp by adapting techniques of [5] and [7]. Thus, we establish GWP in the largest space for which LWP holds.…”
Abstract. We prove low regularity global well-posedness for the 1d Zakharov system and the 3d Klein-Gordon-Schrödinger system, which are systems in two variables u :The Zakharov system is known to be locally well-posed in (u, n) ∈ L 2 × H −1/2 and the Klein-GordonSchrödinger system is known to be locally well-posed in (u, n) ∈ L 2 ×L 2 . Here, we show that the Zakharov and Klein-Gordon-Schrödinger systems are globally well-posed in these spaces, respectively, by using an available conservation law for the L 2 norm of u and controlling the growth of n via the estimates in the local theory.
“…In his work, of particular importance is the gauge transformation defined by 6) with J (f )(x) :=´x −∞ |f (y)| 2 dy, x ∈ R. Through the transformation v = G 1 2 (u), DNLS reduces to i∂ t v + ∂ 2 x v = i|v| 2 ∂ x v (1.7) and the theory of [45] for smooth initial data with sufficiently small H 1 -norm can be applied. This result was improved in the papers by Hayashi and Ozawa [15,16] by reducing DNLS to a system of two semi-linear Schrödinger equations (with no derivatives in the nonlinearities), where it was obtained 3 the global existence of H 1 -solutions under the assumption while the norms of interest remain essentially unchanged, i.e.…”
Abstract. We establish the global well-posedness of the derivative nonlinear Schrödinger equation with periodic boundary condition in the Sobolev space H 1 2 , provided that the mass of initial data is less than 4π. This result matches the one by Miao, Wu, and Xu and its recent mass threshold improvement by Guo and Wu in the non-periodic setting. Below H 1 2 , we show that the uniform continuity of the solution map on bounded subsets of H s does not hold, for any gauge equivalent equation.
“…After the works of [23], [1] and [13] gathering the local and the global well-posedness results, in [15], [2], [16], [3], [4], [25], [11], [12] and [17] one has:…”
ABSTRACT. We study special regularity and decay properties of solutions to the IVP associated to the k-generalized KdV equations. In particular, for datum u 0 ∈ H 3/4 + (R) whose restriction belongs to H l ((b, ∞)) for some l ∈ Z + and b ∈ R we prove that the restriction of the corresponding solution u(·,t) belongs to H l ((β , ∞)) for any β ∈ R and any t ∈ (0, T ). Thus, this type of regularity propagates with infinite speed to its left as time evolves.
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