The pseudo-Anosov prevalence conjecture for simple braids

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Let \Brn\Br_n be the braid group on nn strands, identified with the mapping class group of a disk with nn marked points relative to its boundary. A braid is pseudo-Anosov if its mapping class has pseudo-Anosov Nielsen–Thurston type. Pseudo-Anosov prevalence conjecture. The proportion of simple braids on nn strands that are pseudo-Anosov tends to 100%100\% as nn tends to infinity.

This would sharpen the result that the proportion of simple braids with positive topological entropy tends to 100%100\%, and would be complementary to results of Caruso and Wiest for braids in Cayley balls. Since pseudo-Anosov type is stronger than positive entropy, the proposed statement is left as future work.

References

Primary source

Luke Robitaille and Minh-Tâm Quang Trinh, “Simple Braids Tend toward Positive Entropy”, arXiv:2312.00753 (2024).

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