Geodesic
An $\hbar$-dependent formulation of the Kadomtsev–Petviashvili hierarchy
Teoretičeskaâ i matematičeskaâ fizika, Tome 171 (2012) no. 2, pp. 303-311 Cet article a éte moissonné depuis la source Math-Net.Ru

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We briefly review a recursive construction of $\hbar$-dependent solutions of the Kadomtsev–Petviashvili hierarchy. We give recurrence relations for the coefficients $X_n$ of an $\hbar$-expansion of the operator $X=X_0+\hbar X_1+\hbar^2X_2+\cdots$ for which the dressing operator $W$ is expressed in the exponential form $W=e^{X/\hbar}$. The wave function $\Psi$ associated with $W$ turns out to have the WKB {(}Wentzel–Kramers–Brillouin{\rm)} form $\Psi=e^{S/\hbar}$, and the coefficients $S_n$ of the $\hbar$-expansion $S=S_0+\hbar S_1+\hbar^2S_2+\cdots$ are also determined by a set of recurrence relations. We use this WKB form to show that the associated tau function has an $\hbar$-expansion of the form $\ln\tau=\hbar^{-2}F_0+ \hbar^{-1}F_1+F_2+\dots$.
Keywords: $\hbar$-expansion, Riemann–Hilbert problem, recurrence relation.
Mots-clés : quantization 
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K. Takasaki; T. Takebe. An $\hbar$-dependent formulation of the Kadomtsev–Petviashvili hierarchy. Teoretičeskaâ i matematičeskaâ fizika, Tome 171 (2012) no. 2, pp. 303-311. http://geodesic.mathdoc.fr/item/TMF_2012_171_2_a9/

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