The uniruledness conjecture via Kodaira dimension and RC-positivity

Let XX be a projective manifold, let KXK_X be its canonical bundle, let KX1K_X^{-1} be its anticanonical bundle, and let κ(X)\kappa(X) denote its Kodaira dimension. Uniruledness conjecture. The condition κ(X)=\kappa(X)=-\infty is equivalent to each of the following: XX is uniruled; KXK_X is not pseudo-effective; KX1K_X^{-1} is RC-positive; XX admits a Hermitian metric with positive Chern scalar curvature; and, for every ample line bundle AA, there is a positive integer cAc_A such that

H0(X,KXAk)=0H^0(X,K_X^{\otimes \ell}\otimes A^{\otimes k})=0

whenever cA(k+1)\ell\geq c_A(k+1) and k0k\geq 0. The source notes that the equivalence of uniruledness with non-pseudo-effectivity of KXK_X is already known, but presents the full equivalence as a conjectural formulation.

Sources & referencesView supporting material

Primary source

Xiaokui Yang, “RC-positivity, rational connectedness and Yau's conjecture”, arXiv:1708.06713 (2018).

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