Abstract
We study a class of deformations of infinite-dimensional Poisson manifolds of hydrodynamic type which are of interest in the theory of Frobenius manifolds. We prove two results. First, we show that the second cohomology group of these manifolds, in the Poisson-Lichnerowicz cohomology, is ‘‘essentially’’ trivial. Then, we prove a conjecture of B. Dubrovin about the triviality of homogeneous formal deformations of the above manifolds.
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Communicated by N.A. Nekrasov
Work sponsored by the Italian Ministry of Research under the project 40%: Geometry of Integrable Systems.
Acknowledgements. We sincerely thank B. Dubrovin for introducing us to the problem of deformation of Poisson manifolds of hydrodynamic type. We also thank G. Falqui for many useful discussions. We finally thank the Istituto Nazionale di Alta Matematica of Rome, who supported a meeting on the geometry of Frobenius manifolds, giving us the occasion to meet all together and discuss the problem.
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Degiovanni, L., Magri, F. & Sciacca, V. On Deformation of Poisson Manifolds of Hydrodynamic Type. Commun. Math. Phys. 253, 1–24 (2005). https://doi.org/10.1007/s00220-004-1190-8
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DOI: https://doi.org/10.1007/s00220-004-1190-8