Instability of pole singularities for the Chazy equation
Abstract
We prove that the negative resonances of the Chazy equation (in the sense of Painlevé analysis) can be related directly to its groupinvariance properties. These resonances indicate in this case the instability of pole singularities. Depending on the value of a parameter in the equation, an unstable isolated pole may turn into the familiar natural boundary, or split into several isolated singularities. In the first case, a convergent series representation involving exponentially small corrections can be given. This reconciles several earlier approaches to the interpretation of negative resonances. On the other hand, we also prove that pole singularities with the maximum number of positive resonances are stable. The proofs rely on general properties of nonlinear Fuchsian equations.
 Publication:

Journal of Physics A Mathematical General
 Pub Date:
 March 1998
 DOI:
 10.1088/03054470/31/11/015
 arXiv:
 arXiv:2205.01036
 Bibcode:
 1998JPhA...31.2675K
 Keywords:

 Nonlinear Sciences  Exactly Solvable and Integrable Systems;
 Mathematics  Complex Variables
 EPrint:
 Journal of Physics A: Mathematical and Theoretical, IOP Publishing, 1998, 31, pp.26752690