Rational realization conjecture for the Thue–Morse iterated monodromy covering

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Let HqH_q be the Thue–Morse group, realized as the iterated monodromy group of the degree-qq branched covering described using the post-critical set {0,∞,ζ0,…,ζq−2}\{0,\infty,\zeta^0,\dots,\zeta^{q-2}\}, where ζ=exp⁡(2πi/(q−1))\zeta=\exp(2\pi i/(q-1)). Rational realization conjecture. The branched covering described above is isotopic to a rational map of degree qq. This asserts that the explicitly constructed branched covering has a rational representative, strengthening its description as a topological branched covering and connecting the Thue–Morse self-similar group to complex dynamical systems. No resolution is supplied in the source.

References

Primary source

Laurent Bartholdi, José Manuel Rodríguez Caballero and Ahmed Tanbir, “The Thue-Morse substitutions and self-similar groups and algebras”, arXiv:2005.05126 (2020).

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