No exponentially convergent spectral-ratio families in the P≤ cases

Let hh be a pseudo-Anosov mapping class and let ω(h)\operatorname{\omega}(h) denote its spectral ratio. For a surface and an infinite family of pseudo-Anosov mapping classes, a P_{\leq} case means that ω(h)1+1/poly(h)\operatorname{\omega}(h)\leq 1+1/\operatorname{poly}(|h|), while an E case means that ω(h)1+1/exp(h)\operatorname{\omega}(h)\leq 1+1/\exp(|h|). P_{\leq} versus E conjecture. In all P_{\leq} cases, there is no family of pseudo-Anosov mapping classes whose spectral ratios converge to one exponentially; equivalently, none of the P_{\leq} cases are E cases. The claim distinguishes polynomially slow convergence of the spectral ratio from exponential convergence in the surface-by-surface classification. The supplied text gives no resolution, so the assertion remains open.

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Primary source

Mark C. Bell and Saul Schleimer, “Slow north-south dynamics on PML”, arXiv:1512.00829 (2016).

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