Differential and Integral Equations

Scattering and well-posedness for the Zakharov system at a critical space in four and more spatial dimensions

Isao Kato and Kotaro Tsugawa

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We study the Cauchy problem for the Zakharov system in spatial dimension $d\ge 4$ with initial datum $ (u(0), n(0), \partial_t n(0) )\in H^k(\mathbb R^d)\times \dot{H}^l(\mathbb R^d)\times \dot{H}^{l-1}(\mathbb R^d)$. According to Ginibre, Tsutsumi and Velo ([9]), the critical exponent of $(k,l)$ is $ ((d-3)/2,(d-4)/2 ). $ We prove the small data global well-posedness and the scattering at the critical space. It seems difficult to get the crucial bilinear estimate only by applying the $U^2,\ V^2$ type spaces introduced by Koch and Tataru ([23], [24]). To avoid the difficulty, we use an intersection space of $V^2$ type space and the space-time Lebesgue space $E:=L^2_tL_x^{2d/(d-2)}$, which is related to the endpoint Strichartz estimate.

Article information

Differential Integral Equations, Volume 30, Number 9/10 (2017), 763-794.

First available in Project Euclid: 27 May 2017

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Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 35Q55: NLS-like equations (nonlinear Schrödinger) [See also 37K10] 35B40: Asymptotic behavior of solutions 35A01: Existence problems: global existence, local existence, non-existence 35A02: Uniqueness problems: global uniqueness, local uniqueness, non- uniqueness


Kato, Isao; Tsugawa, Kotaro. Scattering and well-posedness for the Zakharov system at a critical space in four and more spatial dimensions. Differential Integral Equations 30 (2017), no. 9/10, 763--794. https://projecteuclid.org/euclid.die/1495850426

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