Abstract
Sasakian manifolds are odd-dimensional counterpart to Kähler manifolds. They can be defined as contact manifolds equipped with an invariant Kähler structure on their symplectic cone. The quotient of this cone by the homothety action is a complex manifold called Vaisman. We study harmonic forms and Hodge decomposition on Vaisman and Sasakian manifolds. We construct a Lie superalgebra associated to a Sasakian manifold in the same way as the Kähler supersymmetry algebra is associated to a Kähler manifold. We use this construction to produce a self-contained, coordinate-free proof of the results by Tachibana, Kashiwada and Sato on the decomposition of harmonic forms and cohomology of Sasakian and Vaisman manifolds. In the last section, we compute the supersymmetry algebra of Sasakian manifolds explicitly.
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Notes
Here, as elsewhere, “differential operators on the de Rham algebra” are understood in the algebraic sense as above.
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Acknowledgements
L.O. thanks IMPA (Rio de Janeiro) and HSE (Moscow) for financial support and excellent research environment during the preparation of this paper. Both authors thank P.-A. Nagy for useful discussions. We are grateful to Richard Eager for the reference to [28] and to Nikita Klemyatin for pointing out some errors in a first version of the paper. Many thanks to the referee and the editor for very useful comments.
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Liviu Ornea is partially supported by a grant of Ministry of Research and Innovation, CNCS - UEFISCDI, project number PN-III-P4-ID-PCE-2016-0065, within PNCDI III.
Misha Verbitsky is partially supported by by the HSE University Basic Research Program, FAPERJ E-26/202.912/2018 and CNPq - Process 313608/2017-2.
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Ornea, L., Verbitsky, M. Supersymmetry and Hodge theory on Sasakian and Vaisman manifolds. manuscripta math. 170, 629–658 (2023). https://doi.org/10.1007/s00229-021-01358-8
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DOI: https://doi.org/10.1007/s00229-021-01358-8
Keywords
- Lie superalgebra
- Kähler manifold
- Sasakian manifold
- Vaisman manifold
- Reeb field
- Hodge theory
- Transversally Kähler foliation
- Basic forms