Uniqueness of very free curve components in large nef classes

Let XX be a smooth Fano threefold. Write Nef1(X)Z\operatorname{Nef}_1(X)_{\mathbb{Z}} for the integral nef curve classes, and let Mor(P1,X,α)\operatorname{Mor}(\mathbb{P}^1,X,\alpha) denote the space of morphisms of class α\alpha. Uniqueness conjecture for very free components. There exists τNef1(X)Z\tau \in \operatorname{Nef}_1(X)_{\mathbb{Z}} such that for all ατ+Nef1(X)Z\alpha \in \tau + \operatorname{Nef}_1(X)_{\mathbb{Z}}, there is at most one component of Mor(P1,X,α)\operatorname{Mor}(\mathbb{P}^1, X, \alpha) that generically parameterizes very free curves. This is presented as a reformulation of Geometric Manin's Conjecture and is intended to follow from the paper's main theorem in the stated setting; the supplied material does not establish the unrestricted claim as a general theorem.

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Primary source

Andrew Burke and Eric Jovinelly, “Geometric Manin's Conjecture for Fano 3-Folds”, arXiv:2209.05517 (2024).

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