## On the Cauchy problem for Kadomtsev-Petviashvili equation.(English)Zbl 0934.35161

Local solvability and uniqueness of the Cauchy problem for the Kadomtsev-Petviashvili-II (KP-II) equation in the case of two and three space dimensions are studied. The functional spaces used for this are (non-isotropic) modified Sobolev spaces and the associated Bourgain type spaces. In the case of two space dimensions they are $\widetilde H^{b,s_1,s_2} (\mathbb{R}^3)=\biggl\{u; \bigl(1+|\tau |\bigr)^b\bigl(1 +|\xi |\bigr)^{s_1} \bigl(1+ |\eta |\bigr)^{s_2} \bigl(1+|\xi|^{-1} \bigr)\widehat u(\tau, \xi,\eta)\in L^2(\mathbb{R}^3) \biggr\}$ and $$B^{b,s_1s_2} (\mathbb{R}^3)=\{u;U(-t)u\in \widetilde H^{b,s_1,s_2} (\mathbb{R}^3)\}$$, where $$U$$ is the unitary group which defines the free evolution associated with the KP-II equation. The main result obtained in the paper is the following:
Theorem (the case of two space dimensions). Let $$s_1>-1/4$$ and $$s_2\geq 0$$. Then there exists $$b>1/2$$ such that if the initial value of the Cauchy problem for KP-II equation belongs to $$\widetilde H^{s_1,s_2}(\mathbb{R}^2)$$ then there exists a positive $$T$$ (depending on the initial value) and a unique solution of the Cauchy problem in the time interval $$[-T,T]$$ which belongs to $$C([-T,T]; \widetilde H^{s_1,s_2} (\mathbb{R}^2))\cap B^{b,s_1,s_2} (\mathbb{R}^3)$$.
In case of three space dimensions a similar result holds with $$s=s_1=s_2= s_3>3/2$$ and $$b=1/2$$.

### MSC:

 35Q53 KdV equations (Korteweg-de Vries equations) 35A07 Local existence and uniqueness theorems (PDE) (MSC2000)
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### References:

 [1] Ben-Artzi M., Diff. Int. Eq. [2] Bourgain J, Schrödinger equations 3 pp 107– (1993) [3] DOI: 10.1007/BF01895688 · Zbl 0787.35098 [4] Coifman R, Societe Mathematique de France 57 (1978) [5] Ginibre J, Séinaire Bourbaki 796 pp 163– (1996) [6] DOI: 10.1006/jfan.1997.3148 · Zbl 0894.35108 [7] Isaza P. Mejia J. Stallbohm V. El problema de Cauchy parala ecuacion de Kadomtsev-Petviashvili (KP-II) en espacios de Soblolev Hs 1997 [8] Kenig C, J . AMS 9 pp 573– (1996) [9] DOI: 10.1090/S0002-9947-96-01645-5 · Zbl 0862.35111 [10] DOI: 10.1215/S0012-7094-89-05927-9 · Zbl 0795.35105 [11] Sault J.-C, Indiana Univ. Math. J 42 pp 1017– (1993) [12] DOI: 10.1215/S0012-7094-77-04430-1 · Zbl 0372.35001 [13] DOI: 10.1007/BF01210703 · Zbl 0633.35070
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