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Rigidity of Quasiconformal Maps on Carnot Groups

Medwid, Mark Edward
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1497620176117104

Abstract Details

2017, Doctor of Philosophy (Ph.D.), Bowling Green State University, Mathematics.
Quasiconformal mappings were first utilized by Grotzsch in the 1920’s and then later named by Ahlfors in the 1930’s. The conformal mappings one studies in complex analysis are locally angle-preserving: they map infinitesimal balls to infinitesimal balls. Quasiconformal mappings, on the other hand, map infinitesimal balls to infinitesimal ellipsoids of a uniformly bounded eccentricity. The theory of quasiconformal mappings is well-developed and studied. For example, quasiconformal mappings on Euclidean space are almost-everywhere differentiable. A result due to Pansu in 1989 illustrated that quasiconformal mappings on Carnot groups are almost-everywhere (Pansu) differentiable, as well. It is easy to show that a biLipschitz map is quasiconformal but the converse does not hold, in general. There are many instances, however, where globally defined quasiconformal mappings on Carnot groups are biLipschitz. In this paper we show that, under certain conditions, a quasiconformal mapping defined on an open subset of a Carnot group is locally biLipschitz. This result is motivated by rigidity results in geometry (for example, the theorem by Mostow in 1968). Along the way we develop background material on geometric group theory and show its connection to quasiconformal mappings.
Xiangdong Xie (Advisor)
Alexander Tarnovsky (Other)
Mihai Staic (Committee Member)
Juan Bes (Committee Member)
84 p.
Mathematics
quasiconformal mappings; rigidity; Carnot groups; Lie groups; Lie algebras; quasisymmetric mappings; analysis on metric spaces

Recommended Citations

Citations

  • Medwid, M. E. (2017). Rigidity of Quasiconformal Maps on Carnot Groups [Doctoral dissertation, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1497620176117104

    APA Style (7th edition)

  • Medwid, Mark. Rigidity of Quasiconformal Maps on Carnot Groups. 2017. Bowling Green State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1497620176117104.

    MLA Style (8th edition)

  • Medwid, Mark. "Rigidity of Quasiconformal Maps on Carnot Groups." Doctoral dissertation, Bowling Green State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1497620176117104

    Chicago Manual of Style (17th edition)

bgsu1497620176117104
385
© 2017, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.