Guralnick's conjecture on monodromy groups of large-degree indecomposable coverings

Let f:XP1f:X\rightarrow \mathbb P^1 be an indecomposable covering of degree nn, with XX of genus gX=gg_X=g, and let Mon(f)\operatorname{Mon}(f) denote its monodromy group. For each integer g0g\geq 0, there exists a constant NgN_g such that, whenever nNgn\geq N_g, one has one of the following possibilities:

Mon(f)=An or Sn;\operatorname{Mon}(f)=A_n\text{ or }S_n; Mon(f)=Ad or Sdwith n=d(d1)/2 and g=0;\operatorname{Mon}(f)=A_d\text{ or }S_d\quad\text{with }n=d(d-1)/2\text{ and }g=0; Ad2Mon(f)(Sd2)C2,A_d^2\leq \operatorname{Mon}(f)\leq (S_d^2)\rtimes C_2,

where n=d2n=d^2, the semidirect action of C2C_2 permutes the two copies of SdS_d, and g1g\leq 1; or

Mon(f)(Cp)iCk,\operatorname{Mon}(f)\leq (C_p)^i\rtimes C_k,

with i{1,2}i\in\{1,2\}, k{1,2,3,4,6}k\in\{1,2,3,4,6\}, and pp prime, where n=pin=p^i and g1g\leq 1.

Sources & referencesView supporting material

Primary source

Danny Neftin and Michael E. Zieve, “Monodromy groups of product type”, arXiv:2403.17168 (2024).

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