Expected dimension conjecture for Prym–Brill–Noether loci of generic Prym curves

Let CC be a curve of genus gg, and let

f:C~Cf:\widetilde{C}\to C

be a generic Prym curve, meaning an unramified double cover. Let Vr(C,f)V^r(C,f) denote the Prym–Brill–Noether locus of rank-rr linear series associated to ff, and let n(r,k)n(r,k) be the bound defined in the paper for a kk-gonal curve. Suppose that gn(r,k)g\gg n(r,k). Expected-dimension conjecture. Then

dimVr(C,f)=g1n(r,k).\dim V^r(C,f)=g-1-n(r,k).

The claim predicts that the lower bound on the codimension established for the kk-gonal Prym–Brill–Noether locus is attained for generic Prym curves when the genus is sufficiently large. The source gives no resolution of this expectation; the preceding discussion notes that the bound is not always strict and is expected to be strict for sufficiently high genus.

Sources & referencesView supporting material

Primary source

Steven Creech, Yoav Len, Caelan Ritter and Derek Wu, “Prym-Brill-Noether Loci of special curves”, arXiv:1912.02863 (2020).

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