The Group of Hamiltonian Homeomorphisms in the L^\infty-norm

Details The Group of Hamiltonian Homeomorphisms in the L^\infty-norm The Group of Hamiltonian Homeomorphisms in the L^\infty-norm

2007-05-08

arxiv.org/abs/0705.1177v1

J. Korean Math. Soc. 45 (2008), No. 6, pp 1769--1784

Mathematics

Symplectic Geometry

16 pages

Scientific paper

The group Hameo (M,\omega) of Hamiltonian homeomorphisms of a connected symplectic manifold (M,\omega) was defined and studied in [7] and further in [6]. In these papers, the authors consistently used the L^{(1,\infty)}-Hofer norm (and not the L^\infty-Hofer norm) on the space of Hamiltonian paths (see below for the definitions). A justification for this choice was given in [7]. In this article we study the L^\infty-case. In view of the fact that the Hofer norm on the group Ham (M,\omega) of Hamiltonian diffeomorphisms does not depend on the choice of the L^{(1,\infty)}-norm vs. the L^\infty-norm [9], Y.-G. Oh and D. McDuff (private communications) asked whether the two notions of Hamiltonian homeomorphisms arising from the different norms coincide. We will give an affirmative answer to this question in this paper.

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