Secure-torsor counting conjecture for finite étale group schemes

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Let FF be a global field, let GG be a non-trivial finite étale tame FF-group scheme, and let H:BG(F)→R>0H:BG(F)\to\mathbb R_{>0} be a height. A torsor x∈BG(F)x\in BG(F) is secure if it is not in the image of any breaking thin map BR(F)→BG(F)BR(F)\to BG(F), where such maps arise from inner twists of GG and closed subgroup schemes RR and have pullback height with lexicographically larger (a,b)(a,b)-invariants.

Secure-torsor counting conjecture. If FF is a number field, there exists C>0C>0 such that

#{x∈BG(F)∣x is secure and H(x)≤B}∼B→∞CBa(H)log⁡(B)b(H)−1.\#\{x\in BG(F)\mid x\text{ is secure and }H(x)\leq B\}\sim_{B\to\infty}CB^{a(H)}\log(B)^{b(H)-1}.

If FF is a function field, then

#{x∈BG(F)∣x is secure and H(x)≤B}≍B→∞Ba(H)log⁡(B)b(H)−1.\#\{x\in BG(F)\mid x\text{ is secure and }H(x)\leq B\}\asymp_{B\to\infty}B^{a(H)}\log(B)^{b(H)-1}.

This is proposed as an analogue of Malle's conjecture for torsors of finite group schemes. The provided text gives no resolution status.

References

Primary source

Ratko Darda and Takehiko Yasuda, “Torsors for finite group schemes of bounded height”, arXiv:2207.03642 (2022).

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