On quadratic Schrödinger equations in R1+1: a normal form approach
On quadratic Schrödinger equations in R1+1: a normal form approach
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关于 R1+1 中的二次薛定谔方程:一种范式方法
DOI:
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发表时间:
2012
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通讯作者:
A. Stefanov
中科院分区:
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作者:
Seungly Oh;A. Stefanov
For the Schrödinger equation ut + iuxx = 〈▿〉β [u2], β ∈ (0, ½), we establish local well‐posedness in Hβ−1+ (note that if β=0, this matches, up to an endpoint, the sharp result of Bejenaru–Tao [Sharp well‐posedness and ill‐posedness results for a quadratic non‐linear Schrödinger equation, J. Funct. Anal. 233 (2006) 228–259.]). Our approach differs significantly from the previous one, we use normal form transformation to analyze the worst interacting terms in the nonlinearity and then show that the remaining terms are (much) smoother. In particular, this allows us to conclude that u−e−it∂x2 u(0) ∈ H−1/2 (R1), even though u(0) ∈ Hβ−1+.