Coleman's conjecture on the ramification of torsion points of curves

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Let CC be a curve of genus g≥2g \geq 2 embedded in its Jacobian JJ, all defined over a number field KK. Let JtorsJ_{\mathrm{tors}} be the torsion subgroup of JJ and let Ctors:=C(Kˉ)∩JtorsC_{\mathrm{tors}}:= C(\bar{K}) \cap J_{\mathrm{tors}}. Let p\mathfrak{p} be a prime ideal of OK\mathcal{O}_K above a rational prime pp such that p≥5p \geq 5, K/QK/\mathbb{Q} is unramified at p\mathfrak{p}, and CC has good reduction at p\mathfrak{p}. Coleman's conjecture. Then the extension K(Ctors)/KK(C_{\mathrm{tors}})/K is unramified above p\mathfrak{p}. The conjecture concerns quantitative refinements of Raynaud's theorem for curves. Its resolution is not established by the supplied text, so its status remains open here.

References

Primary source

Aurélien Galateau and César Martínez, “A bound for the torsion on subvarieties of abelian varieties”, arXiv:1710.04577 (2017).

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