Relative Clemens conjecture for rational curves on cubic threefolds

From papers

Let XP4X\subset\mathbb{P}^4 be a cubic threefold, let YXY\subset X be a hyperplane, and let CXC\subset X be a smooth rational curve of degree dd, with XX, YY, and CC all general. Let Z=CYZ=C\cap Y and let NC/XN_{C/X} denote the normal bundle of CC in XX. Relative Clemens conjecture. The threefold XX admits only a finite number of general rational curves whose intersection with YY is ZZ. Moreover, every such curve has normal bundle

NC/X(Y)OC(1)OC(1).N_{C/X}(-Y)\cong\mathscr{O}_C(-1)\oplus\mathscr{O}_C(-1).

This is the relative analogue of the Clemens conjecture, prescribing finiteness while fixing the intersection with the hyperplane. The supplied passage gives no resolution status for the assertion.

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Sources & referencesView supporting material

Primary source

Rodolfo Aguilar, “The relative Clemens Conjectures for 12-log Calabi-Yau threefolds”, arXiv:2601.11813 (2026).

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