Geodesic
On the~Kadomtsev-Petviashvili hierarchy in an~extended class of formal pseudo-differential operators
Teoretičeskaâ i matematičeskaâ fizika, Tome 207 (2021) no. 3, pp. 458-488

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We study the existence and uniqueness of the Kadomtsev–Petviashvili (KP) hierarchy solutions in the algebra $\mathcal FCl(S^1,\mathbb K^n)$ of formal classical pseudodifferential operators. The classical algebra $\Psi DO(S^1,\mathbb K^n)$, where the KP hierarchy is well known, appears as a subalgebra of $\mathcal FCl(S^1,\mathbb K^n)$. We investigate algebraic properties of $\mathcal FCl(S^1,\mathbb K^n)$ such as splittings, $r$-matrices, extension of the Gelfand–Dickey bracket, and almost complex structures. We then prove the existence and uniqueness of the KP hierarchy solutions in $\mathcal FCl(S^1,\mathbb K^n)$ with respect to extended classes of initial values. Finally, we extend this KP hierarchy to complex-order formal pseudodifferential operators and describe their Hamiltonian structures similarly to the previously known formal case.
Keywords: formal pseudodifferential operator, Kadomtsev–Petviashvili hierarchy, almost complex structure, almost quaternionic structure. 
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     title = {On {the~Kadomtsev-Petviashvili} hierarchy in an~extended class of formal pseudo-differential operators},
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J.-P. Magnot; V. N. Rubtsov. On the~Kadomtsev-Petviashvili hierarchy in an~extended class of formal pseudo-differential operators. Teoretičeskaâ i matematičeskaâ fizika, Tome 207 (2021) no. 3, pp. 458-488. http://geodesic.mathdoc.fr/item/TMF_2021_207_3_a8/