Renormalization conjecture for infinitely renormalizable Lorenz-map classes

Fix a topological class T\mathcal{T} of infinitely (a,b)(a,b)-renormalizable Lorenz maps, with aa and bb sufficiently large. Let UT\mathcal{U}\subset\mathcal{T} be the nonempty open set and let fTUf^\star\in\mathcal{T}\setminus\mathcal{U} be the renormalization fixed point from the coexistence theorem. Let Wu\mathcal{W}^{\mathrm{u}} denote the unstable manifold of ff^\star, and let rigidity classes and domains of nn times renormalizability have their meanings in this setting. Renormalization conjecture for Lorenz-map classes. T\mathcal{T} is a codimension-22 manifold and ff^\star is hyperbolic. For aa and bb sufficiently large, dimWu=3\dim\mathcal{W}^{\mathrm{u}}=3, TU\mathcal{T}\setminus\mathcal{U} is the stable manifold of ff^\star, U\mathcal{U} is foliated by codimension-11 rigidity classes while TU\mathcal{T}\setminus\mathcal{U} is the rigidity class of ff^\star, and a generic 22-dimensional family F\mathcal{F} intersects U\mathcal{U} in a unique rigidity class. The domains of nn times renormalizability inside F\mathcal{F} shrink super-exponentially in a universal way; if F\mathcal{F} intersects UT\mathcal{U}\setminus\mathcal{T}, then generically these domains shrink exponentially in a universal way. The conjecture describes the expected structure behind coexistence, instability, and parameter universality for these Lorenz-map classes; the source presents the preceding manifold and unstable-manifold results as theorems but leaves this stronger structural statement conjectural.

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Primary source

Marco Martens and Björn Winckler, “Instability of Renormalization”, arXiv:1609.04473 (2017).

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