Computing the Cassels–Tate pairing on 3-isogeny Selmer groups via cubic norm equations

Volume 185 / 2018

Monique van Beek, Tom Fisher Acta Arithmetica 185 (2018), 367-396 MSC: 11G05, 11Y40. DOI: 10.4064/aa171108-11-4 Published online: 10 August 2018


We explain a method for computing the Cassels–Tate pairing on the $3$-isogeny Selmer groups of an elliptic curve. This improves the upper bound on the rank of the elliptic curve coming from a descent by $3$-isogeny, to that coming from a full $3$-descent. One ingredient of our work is a new algorithm for solving cubic norm equations, that avoids the need for any $S$-unit computations. As an application, we show that the elliptic curves with torsion subgroup of order $3$ and rank at least $13$, found by Eroshkin, have rank exactly $13$.


  • Monique van BeekCanons Village 1
    46 Global edu-ro 145beon-gil
    Daejeong-eup, Seogwipo-si
    Jeju-do, 63644, Republic of Korea
  • Tom FisherDPMMS, Centre for Mathematical Sciences
    University of Cambridge
    Wilberforce Road
    Cambridge CB3 0WB, UK

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