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Flexibility of Group Actions on the Circle

Flexibility of Group Actions on the Circle

von Mahan Mj, Sang-Hyun Kim und Thomas Koberda
Softcover - 9783030028541
37,44 €
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Beschreibung

In this partly expository work, a framework is developed for building exotic circle actions of certain classical groups.

The authors give general combination theorems for indiscrete isometry groups of hyperbolic space which apply to Fuchsian and limit groups. An abundance of integer-valued subadditive defect-one quasimorphisms on these groups follow as a corollary.

The main classes of groups considered are limit and Fuchsian groups. Limit groups are shown to admit large collections of faithful actions on the circle with disjoint rotation spectra. For Fuchsian groups, further flexibility results are proved and the existence of non-geometric actions of free and surface groups is established. An account is given of the extant notions of semi-conjugacy, showing they are equivalent.

This book is suitable for experts interested in flexibility of representations, and for non-experts wanting an introduction to group representations into circle homeomorphism groups.


Details

Verlag Springer International Publishing
Ersterscheinung 08. Januar 2019
Maße 23.5 cm x 15.5 cm
Gewicht 236 Gramm
Format Softcover
ISBN-13 9783030028541
Seiten 136

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