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VOL. 55 | 2009 Iterating the hessian: a dynamical system on the moduli space of elliptic curves and dessins d'enfants
Patrick Popescu-Pampu

Editor(s) Jean-Pierre Bourguignon, Motoko Kotani, Yoshiaki Maeda, Nobuyuki Tose

## Abstract

Each elliptic curve can be embedded uniquely in the projective plane, up to projective equivalence. The hessian curve of the embedding is generically a new elliptic curve, whose isomorphism type depends only on that of the initial elliptic curve. One gets like this a rational map from the moduli space of elliptic curves to itself. We call it the hessian dynamical system. We compute it in terms of the $j$-invariant of elliptic curves. We deduce that, seen as a map from a projective line to itself, it has 3 critical values, which correspond to the point at infinity of the moduli space and to the two elliptic curves with special symmetries. Moreover, it sends the set of critical values into itself, which shows that all its iterates have the same set of critical values. One gets like this a sequence of dessins d'enfants. We describe an algorithm allowing to construct this sequence.

## Information

Published: 1 January 2009
First available in Project Euclid: 28 November 2018

zbMATH: 1180.14022
MathSciNet: MR2463492

Digital Object Identifier: 10.2969/aspm/05510083

Subjects:
Primary: 14B05, 32S25, 32S45

Rights: Copyright © 2009 Mathematical Society of Japan

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