An algebraic approach to certain cases of Thurston rigidity

Details An algebraic approach to certain cases of Thurston rigidity An algebraic approach to certain cases of Thurston rigidity

2010-10-21

arxiv.org/abs/1010.4562v1

Mathematics

Dynamical Systems

16 pages

Scientific paper

In the moduli space of polynomials of degree 3 with marked critical points c_1 and c_2, let C_{1,n} be the locus of maps for which c_1 has period n and let C_{2,m} be the locus of maps for which c_2 has period m. A consequence of Thurston's rigidity theorem is that the curves C_{1,n} and C_{2,m} intersect transversally. We give a purely algebraic proof that the intersection points are 3-adically integral and use this to prove transversality. We also prove an analogous result when c_1 or c_2 or both are taken to be preperiodic with tail length exactly 1.

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