Non-torsion primitive-point conjecture for large almost simple Galois extensions

Let C/KC/K be a smooth, projective, hyperelliptic curve of genus g1g\geq 1 with a KK-rational point P0P_0, and embed CC into its Jacobian JCJ_C using P0P_0. Let L/KL/K be a finite Galois extension, write G=Gal(L/K)G=\operatorname{Gal}(L/K), and let PC(L)P\in C(L) be LL-primitive if LL is the smallest Galois extension of KK over which PP is defined. Let m(G)m(G) denote the quantity used in the source. The non-torsion primitive-point conjecture. If GG is nonabelian almost simple and G|G| is sufficiently large, then PP is non-torsion in JC(L)J_C(L); in particular,

dimJC(L)Qm(G).\dim J_C(L)\otimes\mathbb Q\geq m(G).

The conjecture connects large nonabelian Galois groups of fields of definition with Jacobian rank; it is explicitly described as very optimistic and remains open in the source.

Sources & referencesView supporting material

Primary source

Kirti Joshi, “Methods for constructing elliptic and hyperelliptic curves with rational points”, arXiv:1711.06242 (2018).

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