English

Odd degree isolated points on $X_1(N)$ with rational $j$-invariant

Number Theory 2020-06-29 v1

Abstract

Let CC be a curve defined over a number field kk. We say a closed point xCx\in C of degree dd is isolated if it does not belong to an infinite family of degree dd points parametrized by the projective line or a positive rank abelian subvariety of the curve's Jacobian. Building on work of Bourdon, Ejder, Liu, Odumodu, and Viray, we characterize elliptic curves with rational jj-invariant which give rise to an isolated point of odd degree on X1(N)/QX_1(N)/\mathbb{Q} for some positive integer NN.

Keywords

Cite

@article{arxiv.2006.14966,
  title  = {Odd degree isolated points on $X_1(N)$ with rational $j$-invariant},
  author = {Abbey Bourdon and David R. Gill and Jeremy Rouse and Lori D. Watson},
  journal= {arXiv preprint arXiv:2006.14966},
  year   = {2020}
}

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26 pages