Universal maps (maps whose renormalized iterations approximate every map in a given class) are locally generic in several spaces of diffeomorphisms [Bonatti--Díaz 2003, Turaev 2015]. In fluid dynamics, steady Euler flows whose Poincaré maps are universal are also known to be locally dense [Berger--Florio--PeraltaSalas, 2023]. Motivated by Arnold's vision [Arnold, 1966] that the complexity of orbits in celestial mechanics and that in fluids should be comparable, in the present paper we address the question of the existence of universal maps in celestial mechanics. We give a partial answer by proving a weak, finite-dimensional form of universal dynamics. More concretely, we show that every symplectic embedding of the disk into $\mathbb{R}^2$ can be approximated, with arbitrary precision, by a renormalization of a Poincaré map of a restricted planar circular $(n+1)$-body problem, for suitable $n$ and appropriate choice of the masses of the primaries. The proof relies on Gonchenko--Shilnikov--Turaev theory [Turaev 2003, Gonchenko--Turaev--Shilnikov 2007] and requires control of the dynamics near homoclinic tangencies of arbitrarily high order; the techniques developed in [Garrido--Martín--Paradela, 2025] are essential for such control.

Twenty-eight years at a wooden table. Twenty thousand transits, one woman’s handwriting, a payroll line reading twenty-five cents. She mapped the sky’s coordinates, kept them honest &#8…

Fractal Correction Engine for Multi-Body Dynamical Systems Abstract I present a novel computational framework for extending trajectory prediction horizons in chaotic multi-body dynamical systems throu...

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