Nonlocal symmetries and negative hierarchies related to bilinear Bäcklund transformation

doi:10.1088/1674-1056/24/3/030201

Abstract

In this paper, nonlocal symmetries defined by bilinear Bäcklund transformation for bilinear potential KdV (pKdV) equation are obtained. By introducing an auxiliary variable which just satisfies the Schwartzian form of KdV (SKdV) equation, the nonlocal symmetry is localized and the Levi transformation is presented. Besides, based on three different types of nonlocal symmetries for potential KdV equation, three sets of negative pKdV hierarchies along with their bilinear forms are constructed. An impressive result is that the coefficients of the third type of (bilinear) negative pKdV hierarchy (N>0) are variable, which are obtained via introducing an arbitrary parameter by considering the translation invariance of the pKdV equation.

Keywords: nonlocal symmetry bilinear Bä cklund transformation finite transformation negative hierarchy

Received: 22 July 2014
Revised: 15 October 2014
Accepted manuscript online:

PACS:	02.30.Ik	(Integrable systems)
	02.20.-a	(Group theory)
	04.20.Jb	(Exact solutions)

Fund:

Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. LQ13A010014), the National Natural Science Foundation of China (Grant Nos. 11326164, 11401528, and 11275072), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120076110024).

Corresponding Authors: Hu Xiao-Rui
E-mail: baqi2002@163.com

Cite this article:

Hu Xiao-Rui (胡晓瑞), Chen Yong (陈勇) Nonlocal symmetries and negative hierarchies related to bilinear Bäcklund transformation 2015 Chin. Phys. B 24 030201

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Nonlocal symmetries and negative hierarchies related to bilinear Bäcklund transformation

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