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Ramification loci of non-archimedean cubic rational functions

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arxiv 2107.06358 v1 pith:DBQIVDWG submitted 2021-07-13 math.AG

classification math.AG
keywords cubicramificationrationalberkovichfunctionslocinon-archimedeancalculate
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abstract

For a cubic rational function with coefficients in a non-archimedean field $K$ whose residue characteristic is $0$ or greater than $3$, there are $2$ possibilities for the shape of its Berkovich ramification locus, considered as an endomorphism of the Berkovich projective line: one is the connected hull of all the critical points, and the other is consisting of $2$ disjoint segments. In this paper, we list up all the possible forms of cubic rational functions and calculate their ramification loci.

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  1. Blow-up of multipliers in meromorphic families of rational maps

    math.DS 2025-04 conditional novelty 7.0 of 10

    In any degenerating one-parameter family of rational maps, either all periodic multipliers stay uniformly bounded or almost all of them blow up at a power rate, and degenerating cubic families always contain a short r...

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