Murty–Patankar splitting conjecture for absolutely simple abelian varieties

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Let XX be an absolutely simple abelian variety over a number field KK. Say that a prime of KK is a splitting prime for XX when the reduction of XX at that prime is not simple. Murty–Patankar's splitting conjecture. The set of primes of KK where XX splits has positive density if and only if End⁡Kˉ(X)\operatorname{End}_{\bar K}(X) is noncommutative.

This conjecture predicts that positive-density splitting of an absolutely simple abelian variety is governed precisely by whether its geometric endomorphism ring is noncommutative. The supplied text gives no resolution, so its status remains open.

References

Primary source

Jeff Achter, “Split reductions of simple abelian varieties”, arXiv:0806.4421 (2009).

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