Random complex dynamics and semigroups of holomorphic maps

By Hiroki Sumi. 2008

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We investigate the random dynamics of rational maps on the Riemann sphere ℂ̂ and the dynamics of semigroups of rational maps on ℂ̂. We show that regarding random complex dynamics of polynomials, in most cases, the chaos of the averaged system disappears, due to the cooperation of the generators. We investigate the iteration and spectral properties of transition operators. We show that under certain conditions, in the limit stage, ‘singular functions on the complex plane’ appear. In particular, we consider the functions T that represent the probability of tending to infinity with respect to the random dynamics of polynomials. Under certain conditions these functions T are complex analogues of the devil's staircase and Lebesgue's singular functions. More precisely, we show that these functions T are continuous on ℂ̂ and vary only on the Julia sets of associated semigroups. Furthermore, by using ergodic theory and potential theory, we investigate the non‐differentiability and regularity of these functions. We find many phenomena that can hold in the random complex dynamics and the dynamics of semigroups of rational maps, but cannot hold in the usual iteration dynamics of a single holomorphic map. We carry out a systematic study of these phenomena and their mechanisms.

Subfields: Geometry and Topology, Mathematical Physics

View Paper: https://www.semanticscholar.org/paper/4cefdb92dc0139d9af72c2f80b0fd2c16ef18287