Fields of definition of elliptic $k$-curves and the realizability of all genus 2 Sato–Tate groups over a number field
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- by Francesc Fité and Xavier Guitart PDF
- Trans. Amer. Math. Soc. 370 (2018), 4623-4659
Abstract:
Let $A/\mathbb {Q}$ be an abelian variety of dimension $g\geq 1$ that is isogenous over $\overline {\mathbb Q}$ to $E^g$, where $E$ is an elliptic curve. If $E$ does not have complex multiplication (CM), by results of Ribet and Elkies concerning fields of definition of elliptic $\mathbb {Q}$-curves, $E$ is isogenous to a curve defined over a polyquadratic extension of $\mathbb {Q}$. We show that one can adapt Ribet’s methods to study the field of definition of $E$ up to isogeny also in the CM case. We find two applications of this analysis to the theory of Sato–Tate groups: First, we show that $18$ of the $34$ possible Sato–Tate groups of abelian surfaces over $\mathbb {Q}$ occur among at most $51$ $\overline {\mathbb Q}$-isogeny classes of abelian surfaces over $\mathbb {Q}$. Second, we give a positive answer to a question of Serre concerning the existence of a number field over which abelian surfaces can be found realizing each of the $52$ possible Sato–Tate groups of abelian surfaces.References
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Additional Information
- Francesc Fité
- Affiliation: Departament de Matemàtiques, Universitat Politècnica de Catalunya, Edifici Omega, C/Jordi Girona 1–3, 08034 Barcelona, Catalonia
- MR Author ID: 995332
- Email: francesc.fite@gmail.com
- Xavier Guitart
- Affiliation: Departament d’Àlgebra i Geometria, Universitat de Barcelona, Gran via de les Corts Catalanes, 585, 08007 Barcelona, Catalonia
- MR Author ID: 887813
- Email: xevi.guitart@gmail.com
- Received by editor(s): February 11, 2016
- Received by editor(s) in revised form: September 19, 2016
- Published electronically: January 18, 2018
- Additional Notes: The first author was funded by the German Research Council via SFB/TR 45
The second author was partially funded by MTM2012-33830 and MTM2012-34611.
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 682152). - © Copyright 2018 by Francesc Fité and Xavier Guitart
- Journal: Trans. Amer. Math. Soc. 370 (2018), 4623-4659
- MSC (2010): Primary 11G10, 11G15, 14K22
- DOI: https://doi.org/10.1090/tran/7074
- MathSciNet review: 3812090