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THE SPACE OF HYPERKÄHLER METRICS ON A 4-MANIFOLD WITH BOUNDARY

Part of: Global differential geometry Partial differential equations on manifolds; differential operators

Published online by Cambridge University Press:  01 March 2017

JOEL FINE ,
JASON D. LOTAY  and
MICHAEL SINGER
JOEL FINE
Affiliation:
Départment de mathématique, Université libre de Bruxelles (ULB), CP 218, Boulevard du Triomphe, B-1050 Bruxelles, Belgium; joel.fine@ulb.ac.be
JASON D. LOTAY
Affiliation:
Department of Mathematics, University College, London WC1E 6BT, UK; j.lotay@ucl.ac.uk, michael.singer@ucl.ac.uk
MICHAEL SINGER
Affiliation:
Department of Mathematics, University College, London WC1E 6BT, UK; j.lotay@ucl.ac.uk, michael.singer@ucl.ac.uk

Abstract

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Let $X$ be a compact 4-manifold with boundary. We study the space of hyperkähler triples $\unicode[STIX]{x1D714}_{1},\unicode[STIX]{x1D714}_{2},\unicode[STIX]{x1D714}_{3}$ on $X$, modulo diffeomorphisms which are the identity on the boundary. We prove that this moduli space is a smooth infinite-dimensional manifold and describe the tangent space in terms of triples of closed anti-self-dual 2-forms. We also explore the corresponding boundary value problem: a hyperkähler triple restricts to a closed framing of the bundle of 2-forms on the boundary; we identify the infinitesimal deformations of this closed framing that can be filled in to hyperkähler deformations of the original triple. Finally we study explicit examples coming from gravitational instantons with isometric actions of $\text{SU}(2)$.

MSC classification

Primary: 53C26: Hyper-Kähler and quaternionic Kähler geometry, “special” geometry 58J32: Boundary value problems on manifolds
Type
Research Article
Information
Forum of Mathematics, Sigma , Volume 5 , 2017 , e6
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s) 2017

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