Quasimorphisms on surfaces and continuity in the Hofer norm

被引:0
|
作者
Khanevsky, Michael [1 ]
机构
[1] Technion Israel Inst Technol, Math Dept, IL-32000 Haifa, Israel
关键词
Hamiltonian dynamics; Hofer's metric; quasimorphisms; DIFFEOMORPHISMS;
D O I
10.1142/S1793525323500097
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
There are a number of known constructions of quasimorphisms on Hamiltonian groups. We show that on surfaces many of these quasimorphisms are not compatible with the Hofer norm in a sense they are not continuous and not Lipschitz. The only exception known to the author is the Calabi quasimorphism on a sphere [M. Entov and L. Polterovich, Calabi quasimorphism and quantum homology, Int. Math. Res. Not. 2003 (2003) 1635-1676] and induced quasimorphisms on genus-zero surfaces (e.g. [P. Biran, M. Entov and L. Polterovich, Calabi quasimorphisms for the symplectic ball, Commun. Contemp. Math. 6 (2004) 793-802]).
引用
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页码:719 / 738
页数:20
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