K-area, Hofer metric and geometry of conjugacy classes in Lie groups |
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Authors: | Michael Entov |
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Institution: | (1) Department of Pure Mathematics, Faculty of Mathematical Sciences, Weizmann Institute of Science, Rehovot 76100, Israel (e-mail: entov@wisdom.weizmann.ac.il), IL |
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Abstract: | Given a closed symplectic manifold (M,ω) we introduce a certain quantity associated to a tuple of conjugacy classes in the universal cover of the group Ham (M,ω) by means of the Hofer metric on Ham (M,ω). We use pseudo-holomorphic curves involved in the definition of the multiplicative structure on the Floer cohomology of
a symplectic manifold (M,ω) to estimate this quantity in terms of actions of some periodic orbits of related Hamiltonian flows. As a corollary we
get a new way to obtain Agnihotri-Belkale-Woodward inequalities for eigenvalues of products of unitary matrices. As another
corollary we get a new proof of the geodesic property (with respect to the Hofer metric) of Hamiltonian flows generated by
certain autonomous Hamiltonians. Our main technical tool is K-area defined for Hamiltonian fibrations over a surface with
boundary in the spirit of L. Polterovich’s work on Hamiltonian fibrations over S
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Oblatum 23-II-2001 & 9-V-2001?Published online: 20 July 2001 |
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