Alternating-group monodromy conjecture for minimal [1,1]-origamis

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A minimal [1,1][1,1]-origami in H(2g−2)\mathcal{H}(2g-2) has 2g−12g-1 squares, and its monodromy group is a subgroup of the alternating group on these squares. The [1,1][1,1]-origamis considered in Theorem~ are the minimal [1,1][1,1]-origamis constructed by Aougab-Menasco-Nieland and their generalisations.

Alternating-group monodromy conjecture. All of the [1,1][1,1]-origamis in Theorem~ have monodromy group isomorphic to Alt⁡2g−1\operatorname{Alt}_{2g-1}.

The theorem cited in the statement leaves open whether the monodromy group is alternating or projective special linear; this conjecture, based on computer experiments, predicts that the alternating case always occurs. The number of squares, 2g−12g-1, lies below the threshold in a result cited by the authors that would force the monodromy group to contain the alternating group.

References

Primary source

Tarik Aougab, Adam Friedman-Brown, Luke Jeffreys and Jiajie Ma, “On the monodromy and spin parity of single-cylinder origamis in the minimal stratum”, arXiv:2502.09498 (2026).

Additional references

2 papers in this index state this conjecture (2024–2025). The statement above is taken from the most recent of them; the others are arXiv:2406.06036.

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