The converse from Kollár-hyperbolicity to V-hyperbolicity

Let XX be a normal projective variety and let Hπ^1(X)H\subset \hat\pi_1(X) be a closed normal subgroup. Say that (X,H)(X,H) is Kollár-hyperbolic with respect to HH when the corresponding Kollár-hyperbolicity condition holds, and say that (X,H)(X,H) is V-hyperbolic with respect to HH when HH has infinite index and, for every HH-tower πn:XnX\pi_n:X_n\to X, every perverse sheaf PP underlying a mixed Hodge module, and every i0i\ne0,

limnhi(Xn,πnP)degπn=0.\lim_{n\to\infty}\frac{h^i(X_n,\pi_n^*P)}{\deg\pi_n}=0.

Converse conjecture. If XX is Kollár-hyperbolic with respect to HH, then XX is V-hyperbolic with respect to HH.

The preceding lemma proves the converse implication from V-hyperbolicity to Kollár-hyperbolicity, so this conjecture asserts an equivalence. The paper says that supporting evidence is given in subsequent sections; no resolution is stated.

Sources & referencesView supporting material

Primary source

Donu Arapura, “Euler characteristics of Kollár-hyperbolic varieties”, arXiv:2509.04607 (2025).

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