A relationship between rational and multi-soliton solutions of the BKP hierarchy

Nimmo, J.J.C. and Orlov, A.Y. (2005) A relationship between rational and multi-soliton solutions of the BKP hierarchy. Glasgow Mathematical Journal, 47(A), pp. 149-168.

Abstract

We consider a special class of solutions of the BKP hierarchy which we call $\tau$-functions of hypergeometric type. These are series in Schur $Q$-functions over partitions, with coefficients parameterised by a function of one variable $\xi$, where the quantities $\xi(k)$, $k\in\mathbb{Z^+}$, are integrals of motion of the BKP hierarchy. We show that this solution is, at the same time, a infinite soliton solution of a dual BKP hierarchy, where the variables $\xi(k)$ are now related to BKP higher times. In particular, rational solutions of the BKP hierarchy are related to (finite) multi-soliton solution of the dual BKP hierarchy. The momenta of the solitons are given by the parts of partitions in the Schur $Q$-function expansion of the $\tau$-function of hypergeometric type. We also show that the KdV and the NLS soliton $\tau$-functions coinside the BKP $\tau$-functions of hypergeometric type, evaluated at special point of BKP higher time; the variables $\xi$ (which are BKP integrals of motions) being related to KdV and NLS higher times.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Nimmo, Dr Jonathan
• Authors: Nimmo, J.J.C., and Orlov, A.Y.
• Subjects: Q Science > QA Mathematics
• College/School: College of Science and Engineering > School of Mathematics and Statistics > Mathematics
• Journal Name: Glasgow Mathematical Journal
• Publisher: Cambridge University Press
• ISSN: 0017-0895
• ISSN (Online): 1469-509X
• Published Online: 14 July 2005
• Copyright Holders: Copyright © 2005 Cambridge University Press
• First Published: First published in Glasgow Mathematical Journal 47(A):149-168
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.