A birational mapping with a strange attractor: Post critical set and covariant curves

Details A birational mapping with a strange attractor: Post critical set and covariant curves A birational mapping with a strange attractor: Post critical set and covariant curves

2009-06-14

arxiv.org/abs/0906.2542v1

Physics

Mathematical Physics

26 pages, 11 figures

Scientific paper

We consider some two-dimensional birational transformations. One of them is a birational deformation of the H\'enon map. For some of these birational mappings, the post critical set (i.e. the iterates of the critical set) is infinite and we show that this gives straightforwardly the algebraic covariant curves of the transformation when they exist. These covariant curves are used to build the preserved meromorphic two-form. One may have also an infinite post critical set yielding a covariant curve which is not algebraic (transcendent). For two of the birational mappings considered, the post critical set is not infinite and we claim that there is no algebraic covariant curve and no preserved meromorphic two-form. For these two mappings with non infinite post critical sets, attracting sets occur and we show that they pass the usual tests (Lyapunov exponents and the fractal dimension) for being strange attractors. The strange attractor of one of these two mappings is unbounded.

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