Cyclic Galois group conjecture for generic spectral covers

Let XX be a compact Riemann surface of genus gXg_X, and let LXL\to X be a holomorphic line bundle of positive degree. Fix a generic section

sH0(X,Lr)s\in H^0(X,L^r)

with distinct zeros, and consider the smooth integral cyclic spectral cover π:XsX\pi:X_s\to X and the induced extension of function fields. Cyclic Galois group conjecture. This extension is Galois, and the Galois group of the cover π\pi is cyclic of order rr. The conjecture concerns the persistence of the expected cyclic Galois structure for generic spectral covers over compact Riemann surfaces; the source notes that it is believed to hold in higher genus but gives no definite reference for a proof.

Sources & referencesView supporting material

Primary source

Kuntal Banerjee and Steven Rayan, “A generalized spectral correspondence”, arXiv:2310.02413 (2025).

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