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Doctoral thesis
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English

Poisson-Lie groups and inequalities

ContributorsDavydenkova, Irina
Defense date2014-01-27
Abstract

In this thesis, we establish a new link between Poisson Geometry and Combinatorics. We introduce the notion of tropicalization for Poisson structures on R^n with coefficients in Laurent polynomials. To such a Poisson structure we associate a polyhedral cone and a constant Poisson bracket on this cone. There is a version of this formalism applicable to C^n viewed as a real Poisson manifold. In this case, the tropicalization gives rise to a completely integrable system with action variables taking values in a polyhedral cone and angle variables spanning a torus. The main example considered in the thesis is the canonical Poisson bracket on the dual Poisson-Lie group G^* for G=U(n) in the cluster coordinates of Fomin-Zelevinsky defined by a certain choice of solid minors. We prove that the corresponding integrable system is isomorphic to the Gelfand-Zeitlin completely integrable system of Guillemin-Sternberg and Flaschka-Ratiu.

eng
Keywords
  • Poisson geometry
  • Poisson-Lie groups
  • Tropicalization
  • Integrable systems
Citation (ISO format)
DAVYDENKOVA, Irina. Poisson-Lie groups and inequalities. 2014. doi: 10.13097/archive-ouverte/unige:34471
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