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Characterisation theorems for compact hypercomplex manifolds

Part of: Pseudogroups, differentiable groupoids and general structures on manifolds Generalized function theory Analytic spaces Fiber spaces and bundles

Published online by Cambridge University Press:  09 April 2009

S. Nag ,
J. A. Hillman  and
B. Datta
S. Nag
Affiliation:
Mathematics/Statistics DivisionIndian Statistical Institute203, B. T. Road Calcutta 700035, India
J. A. Hillman
Affiliation:
School of Mathematics and Physics Macquarie UniversityNorth Ryde, N.S.W. 2113, Australia
B. Datta
Affiliation:
Mathematics/Statistics DivisionIndian Statistical Institute203 B. T. Road Calcutta 700035, India
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Abstract

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We have defined and studied some pseudogroups of local diffeomorphisms which generalise the complex analytic pseudogroups. A 4-dimensional (or 8-dimensional) manifold modelled on these ‘Further pseudogroups’ turns out to be a quaternionic (respectively octonionic) manifold.

We characterise compact Further manifolds as being products of compact Riemann surfaces with appropriate dimensional spheres. It then transpires that a connected compact quaternionic (H) (respectively O) manifold X, minus a finite number of circles (its ‘real set’), is the orientation double covering of the product Y × P2, (respectively Y×P6), where Y is a connected surface equipped with a canonical conformal structure and Pn is n-dimensonal real projective space.

A corollary is that the only simply-connected compact manifolds which can allow H (respectively O) structure are S4 and S2 × S2 (respectively S8 and S2×S6).

Previous authors, for example Marchiafava and Salamon, have studied very closely-related classes of manifolds by differential geometric methods. Our techniques in this paper are function theoretic and topological.

MSC classification

Secondary: 30G35: Functions of hypercomplex variables and generalized variables 32C99: None of the above, but in this section 55R10: Fiber bundles 58H05: Pseudogroups and differentiable groupoids
Type
Research Article
Information
Journal of the Australian Mathematical Society , Volume 43 , Issue 2 , October 1987 , pp. 231 - 245
Copyright
Copyright © Australian Mathematical Society 1987

References

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