Clausen's conjecture on analytic syntomic cohomology of the pp-adic complex numbers

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For an integer n≥2n\geq 2, let RΓ(CpSyn,O{n})R\Gamma(\mathbb{C}_p^\mathrm{Syn},\mathcal{O}\{n\}) denote analytic syntomic cohomology of Cp\mathbb{C}_p with coefficients in the nn-th Tate-twisted structure sheaf, and let Bcrys+B_\mathrm{crys}^+ be the crystalline period ring with Frobenius ϕ\phi. The notation Zp(n)[−1]\mathbb{Z}_p(n)[-1] denotes the nn-th Tate twist shifted by −1-1. Clausen's conjecture. For n≥2n\geq 2, one has

RΓ(CpSyn,O{n})≅(Bcrys+)ϕ=pn/Zp(n)[−1].R\Gamma(\mathbb{C}_p^\mathrm{Syn},\mathcal{O}\{n\})\cong (B_\mathrm{crys}^+)^{\phi=p^n}/\mathbb{Z}_p(n)[-1].

This conjecture is motivated by calculations of the KK-theory of nuclear solid modules over Cp\mathbb{C}_p and an expected Atiyah--Hirzebruch spectral sequence relating that analytic KK-theory to analytic syntomic cohomology. Its status is not determined in the supplied source.

References

Primary source

Maximilian Hauck, “Rational analytic syntomic cohomology”, arXiv:2604.15193 (2026).

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