Acta mathematica scientia,Series B ›› 2017, Vol. 37 ›› Issue (4): 1061-1082.doi: 10.1016/S0252-9602(17)30058-9

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SHARP WELL-POSEDNESS OF THE CAUCHY PROBLEM FOR THE HIGHER-ORDER DISPERSIVE EQUATION

Minjie JIANG1, Wei YAN1, Yimin ZHANG2   

  1. 1. College of Mathematics and Information Science, Henan Normal University, Xinxiang 453007, China;
    2. School of Science, Wuhan University of Technology, Wuhan 430070, China
  • Received:2016-02-24 Revised:2016-12-24 Online:2017-08-25 Published:2017-08-25
  • Contact: Wei YAN,E-mail:yanwei19821115@sina.cn E-mail:yanwei19821115@sina.cn
  • About author:Minjie JIANG,E-mail:1764915956@qq.com;Yimin ZHANG,E-mail:zhangym802@126.com
  • Supported by:

    This work is supported by Natural Science Foundation of China NSFC (11401180 and 11471330). The second author is also supported by the Young Core Teachers Program of Henan Normal University (15A110033). The third author is also supported by the Fundamental Research Funds for the Central Universities (WUT:2017 IVA 075).

Abstract:

This current paper is devoted to the Cauchy problem for higher order dispersive equation
ut + x2n+1u=x(u∂xnu) + xn-1(ux2), n ≥ 2, nN+.
By using Besov-type spaces, we prove that the associated problem is locally well-posed in H(-n/2 + 3/4,-1/2n)(R). The new ingredient is that we establish some new dyadic bilinear estimates. When n is even, we also prove that the associated equation is ill-posed in H(s,a)(R) with s < -n/2 + 3/4 and all a ∈ R.

Key words: Cauchy problem, sharp well-posedness, modified Bourgain spaces

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