Corrected rank conjecture for twin prime elliptic curves

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Let p≥7p\geq7 and let (p,p−2)(p,p-2) be a twin-prime pair. Define the twin-prime elliptic curve by

Ep:y2=x(x−2)(x−p).E_p:y^2=x(x-2)(x-p).

Write r(Ep)r(E_p) for its Mordell-Weil rank. Corrected twin-prime rank conjecture.

r(Ep)={0if p≡7(mod8),1if p≡3,5(mod8),0 or 2if p≡1(mod8).r(E_p)=\begin{cases} 0 & \text{if }p\equiv7\pmod8,\\ 1 & \text{if }p\equiv3,5\pmod8,\\ 0\text{ or }2 & \text{if }p\equiv1\pmod8.\end{cases}

The first case is established in the cited prior work, and the source proves the analytic-rank lower bound and relevant rank upper bound for the middle cases. The full assertion, especially the exact Mordell-Weil rank in the p≡3(mod8)p\equiv3\pmod8 case and the alternatives in the p≡1(mod8)p\equiv1\pmod8 case, remains conjectural.

References

Primary source

Kirti Joshi, “On the analytic rank of the twin prime elliptic curve y^2=x(x-2)(x-p)”, arXiv:2508.12340 (2025).

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