Modulo-p3p^3 conjecture for products of truncated hypergeometric series

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Let dd satisfy the hypotheses in Theorem main\mathrm{main}, put b=(12,1d,d−1d){\bf b}=(\frac12,\frac{1}{d},\frac{d-1}{d}), and let E~d((1−1−λ)/2)\widetilde{E}_d((1-\sqrt{1-\lambda})/2) be the associated elliptic curve. Let [G]p−1(λ)[G]_{p-1}(\lambda) denote truncation at degree p−1p-1, and let upu_p be the unit root of geometric Frobenius at pp acting on the first cohomology of this elliptic curve. The constants are k2=k6=−1k_2=k_6=-1, k3=−3k_3=-3, and k4=−2k_4=-2.

Product supercongruence conjecture. For primes p≥5p\geq 5,

[F0,b⋅F2αN,b]p−1(λ)≡{0if E~d(1−1−λ2) is supersingular at p,up2pif E~d(1−1−λ2) is ordinary at p and (1−λp)=1,−(kdp)up2pif E~d(1−1−λ2) is ordinary at p and (1−λp)=−1(modp3).[F_{0,{\bf b}}\cdot F_{2\alpha_N,{\bf b}}]_{p-1}(\lambda)\equiv \begin{cases} 0 & \text{if }\widetilde{E}_d\left(\frac{1-\sqrt{1-\lambda}}{2}\right)\text{ is supersingular at }p,\\ u_p^2p & \text{if }\widetilde{E}_d\left(\frac{1-\sqrt{1-\lambda}}{2}\right)\text{ is ordinary at }p\text{ and }\left(\frac{1-\lambda}{p}\right)=1,\\ -\left(\frac{k_d}{p}\right)u_p^2p & \text{if }\widetilde{E}_d\left(\frac{1-\sqrt{1-\lambda}}{2}\right)\text{ is ordinary at }p\text{ and }\left(\frac{1-\lambda}{p}\right)=-1 \end{cases} \pmod{p^3}.

The paper states that this conjecture is verified in the cases arising from two displayed examples using Beukers's theorem; the general assertion is therefore not established by the supplied text.

References

Primary source

Angelica Babei, Manami Roy, Holly Swisher, Bella Tobin and Fang-Ting Tu, “Supercongruences arising from Ramanujan-Sato Series”, arXiv:2408.08844 (2025).

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