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Banach Poisson–Lie Groups and Bruhat–Poisson Structure of the Restricted Grassmannian

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The first part of this paper is devoted to the theory of Poisson–Lie groups in the Banach setting. Our starting point is the straightforward adaptation of the notion of Manin triples to the Banach context. The difference with the finite-dimensional case lies in the fact that a duality pairing between two non-reflexive Banach spaces is necessary weak (as opposed to a strong pairing where one Banach space can be identified with the dual space of the other). The notion of generalized Banach Poisson manifolds introduced in this paper is compatible with weak duality pairings between the tangent space and a subspace of the dual. We investigate related notion like Banach Lie bialgebras and Banach Poisson–Lie groups, suitably generalized to the non-reflexive Banach context. The second part of the paper is devoted to the treatment of particular examples of Banach Poisson–Lie groups related to the restricted Grassmannian and the KdV hierarchy. More precisely, we construct a Banach Poisson–Lie group structure on the unitary restricted Banach Lie group which acts transitively on the restricted Grassmannian. A“dual” Banach Lie group consisting of (a class of) upper triangular bounded operators admits also a Banach Poisson–Lie group structure of the same kind. We show that the restricted Grassmannian inherits a generalized Banach Poisson structure from the unitary Banach Lie group, called Bruhat–Poisson structure. Moreover the action of the triangular Banach Poisson–Lie group on it is a Poisson map. This action generates the KdV hierarchy, and its orbits are the Schubert cells of the restricted Grassmannian.

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Acknowledgements

I would first and foremost like to thank T.S. Ratiu who brought the theory of Poisson–Lie groups to my attention when I was a post-graduate in Lausanne. It was only much later that I understood it to be the key to understanding [52] via the Poisson theory. I could not have written my paper without the help of D. Beltiţă who not only gave me the references indicating where the problem of triangulating an operator was studied, but who also gave me the electronic version of the documents when I was unable to go to any library. My paper was finally produced thanks to the support of the CNRS, of the University of Lille (France), in particular thanks to the CEMPI Labex (ANR-11-LABX-0007-01), as well as to the Pauli Institute in Vienna (Austria) offering very nice working conditions. The special assistance given by the CNRS for the promotion of women scientists was crucial for the inception of this paper which also benefited from the exchange in the early months of 2015 with other researchers during the Shape Analysis programme at the Erwin Schrodinger Institute in Vienna. The discussions with C. Vizman, K.-H. Neeb and F. Gay-Balmaz were particularly fruitful as were the WGMP lectures (exchanges with D. Beltiţă, T. Golinski, F. Pelletier, C. Roger and, last but not least, G. Larotonda). I am grateful to the anonymous referees for their pertinent comments which made me improve the quality of this paper. Finally I heartily thank Y. Kosmann-Schwarzbach and D. Bennequin for their valuable appreciations of a presentation of my paper.

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Correspondence to A. B. Tumpach.

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Communicated by Y. Kawahigashi

Dedicated to T.S. Ratiu for his 70’s birthday and for the contagious enthusiasm he has in doing Mathematics.

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Tumpach, A.B. Banach Poisson–Lie Groups and Bruhat–Poisson Structure of the Restricted Grassmannian. Commun. Math. Phys. 373, 795–858 (2020). https://doi.org/10.1007/s00220-019-03674-3

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