Symplectic reduction of quasi-morphisms and quasi-states. (English) Zbl 1266.53069

The paper under review develops a method based on the symplectic reduction, which leads to new examples of quasi-morphisms and symplectic quasi-states in the sense of M. Entov and L. Polterovich [Int. Math. Res. Not. 2003, No. 30, 1635–1676 (2003; Zbl 1047.53055); Comment. Math. Helv. 81, No. 1, 75–99 (2006; Zbl 1096.53052)], by starting from known examples.


53D20 Momentum maps; symplectic reduction
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