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arXiv 2101.04523math-phmath.MPmath.OAnlin.SI
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关于广义伪微分算子族的Kadomtsev-Petviashvili族

On the Kadomtsev-Petviashvili hierarchy in an extended class of formal pseudo-differential operators

Jean-Pierre Magnot, Vladimir Rubtsov

摘要:

研究了形式古典伪微分算子代数$\F Cl(S^1,\K^n)$中Kadomtsev-Petviashvili(KP)族解的存在唯一性.经典代数$ΨDO(S^1,\K^n)$的KP族是众所周知的出现作为一个子代数$\F Cl(S^1,\K^n).$我们研究了$\F Cl(S^1,\K^n)$的代数性质,如分裂,r-矩阵,扩张的Gelfand-Dickii括号,几乎复结构。然后,我们证明了$\F Cl(S^1,\K^n)$中KP族解关于扩展初值的存在唯一性。最后,我们扩展这个KP层次复杂的顺序正式的伪微分算子,我们描述他们的哈密顿结构类似于以前已知的正式情况。

英文摘要:

We study the existence and uniqueness of the Kadomtsev-Petviashvili (KP) hierarchy solutions in the algebra of $\F Cl(S^1,\K^n)$ of formal classical pseudo-differential operators. The classical algebra $ΨDO(S^1,\K^n)$ where the KP hierarchy is well-known appears as a subalgebra of $\F Cl(S^1,\K^n).$ We investigate algebraic properties of $\F Cl(S^1,\K^n)$ such as splittings, r-matrices, extension of the Gelfand-Dickii bracket, almost complex structures. Then, we prove the existence and uniqueness of the KP hierarchy solutions in $\F Cl(S^1,\K^n)$ with respect to extended classes of initial values. Finally, we extend this KP hierarchy to complex order formal pseudo-differential operators and we describe their Hamiltonian structures similarly to previously known formal case.

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