This book presents the theory of optimal and critical regularities of groups of diffeomorphisms, from the classical work of Denjoy and Herman, up through recent advances. Beginning with an investigation of regularity phenomena for single diffeomorphisms, the book goes on to describes a circle of ideas surrounding Filipkiewicz's Theorem, which recovers the smooth structure of a manifold from its full diffeomorphism group. Topics covered include the simplicity of homeomorphism groups, differentiability of continuous Lie group actions, smooth conjugation of diffeomorphism groups, and the reconstruction of spaces from group actions. Various classical and modern tools are developed for controlling the dynamics of general finitely generated group actions on one-dimensional manifolds, subject to regularity bounds, including material on Thompson's group F, nilpotent groups, right-angled Artin groups, chain groups, finitely generated groups with prescribed critical regularities, and applications to foliation theory and the study of mapping class groups.
The book will be of interest to researchers in geometric group theory.
Thomas Koberda is an Associate Professor at the University of Virginia. He received his PhD in 2012 from Harvard University, under the direction of Curtis T. McMullen. He held an NSF postdoctoral fellowship and was a Gibbs Assistant Professor at Yale University from 2012 to 2015, before joining the faculty at the University of Virginia in 2015, where he was appointed Associate Professor in 2019. In 2017, he was named an Alfred P. Sloan Foundation Research Fellow and was awarded the Kamil Duszenko Prize for his work in geometric group theory.