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29 March 2020
 
  » arxiv » math.DG/0301171

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Twistor theory of hyper-K{ähler metrics with hidden symmetries
Maciej Dunajski ; Lionel J. Mason ;
Date 16 Dec 2002
Journal J.Math.Phys. 44 (2003) 3430-3454
Subject Differential Geometry; Exactly Solvable and Integrable Systems | math.DG gr-qc hep-th nlin.SI
AbstractWe briefly review the hierarchy for the hyper-Kähler equations and define a notion of symmetry for solutions of this hierarchy. A four-dimensional hyper-Kähler metric admits a hidden symmetry if it embeds into a hierarchy with a symmetry. It is shown that a hyper-Kähler metric admits a hidden symmetry if it admits a certain Killing spinor. We show that if the hidden symmetry is tri-holomorphic, then this is equivalent to requiring symmetry along a higher time and the hidden symmetry determines a `twistor group’ action as introduced by Bielawski cite{B00}. This leads to a construction for the solution to the hierarchy in terms of linear equations and variants of the generalised Legendre transform for the hyper-Kähler metric itself given by Ivanov & Rocek cite{IR96}. We show that the ALE spaces are examples of hyper-Kähler metrics admitting three tri-holomorphic Killing spinors. These metrics are in this sense analogous to the ’finite gap’ solutions in soliton theory. Finally we extend the concept of a hierarchy from that of cite{DM00} for the four-dimensional hyper-Kähler equations to a generalisation of the conformal anti-self-duality equations and briefly discuss hidden symmetries for these equations.
Source arXiv, math.DG/0301171
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