Polydisk–Hirzebruch staircase correspondence conjecture

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Define f:R→Rf:\mathbb{R}\to\mathbb{R} by sending a number zz to the number whose continued fraction is obtained from the continued fraction of zz by subtracting one from each entry. Let accum\mathrm{accum} and accumH\mathrm{accum}_H denote the accumulation-point functions for the polydisk and Hirzebruch-surface embedding functions, respectively. For bb in the domain of accumH\mathrm{accum}_H, set

b=accumH−1∘f∘accum(β).b=\mathrm{accum}_H^{-1}\circ f\circ\mathrm{accum}(\beta).

Staircase correspondence conjecture. For every β≥3\beta\geq\sqrt{3}, the function cβc_\beta has an infinite staircase if and only if the function cHbc_{H_b} has an infinite staircase.

This conjecture proposes a correspondence between infinite staircases for polydisks and Hirzebruch surfaces under the continued-fraction transformation ff. The source gives no proof or resolution.

References

Primary source

Caden Farley, Tara Holm, Nicki Magill, Jemma Schroder, Morgan Weiler, Zichen Wang and Elizaveta Zabelina, “Four-periodic infinite staircases for four-dimensional polydisks”, arXiv:2210.15069 (2023).

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