Topological bifurcation structure of one-parameter families of C
1 unimodal maps
-
Published:2021-10-14
Issue:11
Volume:34
Page:7991-8016
-
ISSN:0951-7715
-
Container-title:Nonlinearity
-
language:
-
Short-container-title:Nonlinearity
Author:
Sannami Atsuro,Yokoyama Tomoo
Abstract
Abstract
We consider the bifurcation structure of one-parameter families of unimodal maps whose differentiability is only C
1. The structure of its bifurcation diagram can be a very wild one in such case. However we prove that in a certain topological sense, the structure is the same as that of the standard family of quadratic polynomials. In the case of families of polynomials, irreducible component of the bifurcation diagram can be defined naturally by dividing by the polynomials corresponding to lower periods. We show that such an irreducible component can be defined even if the maps and the family satisfy only a very mild differentiability condition. By removing components of lower periods, the structure of the bifurcation diagram becomes a considerably simplified one. We prove that the symbolic condition for the irreducible components is exactly the same as that of the standard family of quadratic polynomials. When we consider families of maps without strict conditions, the bifurcation diagrams may have infinitely many wild components. We show that such a situation does not affect the irreducible component essentially by proving a separation theorem for compact set in the plane which asserts that a given connected component can be cut out from the compact set by a curve.
Funder
Japan Science and Technology Agency
Japan Society for the Promotion of Science
Subject
Applied Mathematics,General Physics and Astronomy,Mathematical Physics,Statistical and Nonlinear Physics
Reference16 articles.
1. Foliations with all leaves compact;Epstein;Ann. Inst. Fourier,1976