Nontriviality of the Nori fundamental group of fake projective planes in positive characteristic

From papers

Let XX be a fake projective plane over an algebraically closed field of characteristic p>0p>0, meaning a smooth projective surface with the same Betti numbers as the projective plane and satisfying q=0q=0, pg=0p_g=0, and KX2=9K_X^2=9. Let π1Nori(X)\pi_1^{Nori}(X) denote its Nori fundamental group scheme. Nontriviality conjecture. One should have

π1Nori(X)1.\pi_1^{Nori}(X)\neq 1.

In characteristic zero, the corresponding nontriviality follows from the preceding argument, whereas the positive-characteristic assertion is presented as a conjectural extension and is not resolved here.

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Sources & referencesView supporting material

Primary source

Kirti Joshi, “On surfaces satisfying q=0,p_g=0,c_1^2=9”, arXiv:2508.12339 (2025).

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