Hurwitz transitivity conjecture for Singer-cycle factorizations

Let cc be a Singer cycle in GLn(Fq)GL_n({\mathbb{F}}_q), and consider ordered factorizations c=t1t2tc=t_1t_2\cdots t_\ell into reflections. The multiset {det(ti)}i=1\{\det(t_i)\}_{i=1}^\ell is an invariant of the Hurwitz action of the braid group on these factorizations. Hurwitz transitivity conjecture. Any two factorizations c=t1t2tc=t_1 t_2 \cdots t_\ell with the same multiset {det(ti)}i=1\{\det(t_i)\}_{i=1}^\ell lie in the same Hurwitz orbit. In particular, there is only one Hurwitz orbit of factorizations when q=2q=2 for any \ell. This is an analogue of the transitivity theorem for shortest factorizations of Coxeter elements in well-generated complex reflection groups; the determinant multiset is the evident obstruction when q2q\ne 2.

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Primary source

Joel Brewster Lewis, Victor Reiner and Dennis Stanton, “Reflection factorizations of Singer cycles”, arXiv:1308.1468 (2014).

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