The Recursion operators of the BKP hierarchy and the CKP Hierarchy

Details The Recursion operators of the BKP hierarchy and the CKP Hierarchy The Recursion operators of the BKP hierarchy and the CKP Hierarchy

2012-01-08

arxiv.org/abs/1201.1612v1

Physics

Mathematical Physics

19 pages

Scientific paper

In this paper, under the constraints of the BKP(CKP) hierarchy, a crucial observation is that the odd dynamical variable $u_{2k+1}$ can be explicitly expressed by the even dynamical variable $u_{2k}$ in the Lax operator $L$ through a new operator $B$. Using operator $B$, the essential differences between the BKP hierarchy and the CKP hierarchy are given by the flow equations and the recursion operators under the $(2n+1)$-reduction. The formal formulas of the recursion operators for the BKP and CKP hierarchy under $(2n+1)$-reduction are given. To illustrate this method, the two recursion operators are constructed explicitly for the 3-reduction of the BKP and CKP hierarchies. The $t_7$ flows of $u_2$ are generated from $t_1$ flows by the above recursion operators, which are consistent with the corresponding flows generated by the flow equations under 3-reduction.

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