The torsion and B-free conjectures for cyclotomic points on hyperelliptic Jacobians

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Let ℓ\ell be a prime, k≥0k\geq 0, and dd a fixed dimension. A cyclotomic point means a rational point defined over a cyclotomic extension, and Dℓk+1D_{\ell^{k+1}} denotes the dihedral group with the indicated rotation order. Torsion and B-free conjectures. There is a negative conclusion to the stated assertion concerning the existence, for each kk, of a Q\mathbb Q-cyclotomic point of order ℓk+1\ell^{k+1} among all hyperelliptic Jacobians of any fixed dimension dd. Without any bound BB, for each ℓk+1\ell^{k+1} there is a Q\mathbb Q-cyclotomic point on some hyperelliptic Jacobian corresponding to a (Dℓk+1,C2r)(D_{\ell^{k+1}},\mathbf C_{2^r}) regular inverse Galois problem involution realization, with rr dependent on ℓk+1\ell^{k+1}. These conjectures relate torsion on hyperelliptic Jacobians to the regular inverse Galois problem, while the source records that the relevant involution realizations are known only in limited cases.

References

Primary source

Michael David Fried, “Moduli relations between l-adic representations and the regular inverse Galois problem”, arXiv:2008.01603 (2020).

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