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

Let \ell be a prime, k0k\geq 0, and dd a fixed dimension. A cyclotomic point means a rational point defined over a cyclotomic extension, and Dk+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 k+1\ell^{k+1} among all hyperelliptic Jacobians of any fixed dimension dd. Without any bound BB, for each k+1\ell^{k+1} there is a Q\mathbb Q-cyclotomic point on some hyperelliptic Jacobian corresponding to a (Dk+1,C2r)(D_{\ell^{k+1}},\mathbf C_{2^r}) regular inverse Galois problem involution realization, with rr dependent on k+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.

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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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