Genus bound for low-degree curves on complete intersection threefolds

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Let X=Z(f1,…,fn−3)⊂PnX=Z(f_1,\dots,f_{n-3})\subset\mathbb{P}^n be a complete intersection threefold, where fif_i has degree kik_i, and let C⊂XC\subset X be a curve of degree dd and genus gg. The genus-bound conjecture. If

d≤12(k1⋯kn−3),d\leq\frac{1}{2}(k_1\cdots k_{n-3}),

then

g≤d2(k1+⋯+kn−3−n−1)+2d3+1.g\leq\frac{d}{2}(k_1+\cdots+k_{n-3}-n-1)+\frac{2d}{3}+1.

This is presented as a special case of the Bayer–Macrì–Toda inequality for the ideal sheaf of CC. The paper notes that the bound is expected from Bridgeland stability and that a broader genus bound for curves of arbitrary degree is conjectured subsequently.

References

Primary source

Rebecca Tramel, “The genus of projective curves on complete intersection surfaces”, arXiv:1408.3543 (2014).

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