Genus 1 curves in Severi–Brauer surfaces

Author:

Saltman David

Abstract

In a talk at the Banff International Research Station in 2015, Asher Auel asked questions about genus one curves in Severi-Brauer varieties S B ( A ) SB(A) . More specifically, he asked about the smooth cubic curves in Severi-Brauer surfaces, that is, in S B ( D ) SB(D) where D / F D/F is a degree three division algebra. Even more specifically, he asked about the Jacobian, E E , of these curves. In this paper we give a version of an answer to both these questions, describing the surprising connection between these curves and properties of the algebra  A A . Let F F contain ρ \rho , a primitive third root of one. Since D / F D/F is cyclic, it is generated over F F by x , y x,y such that x y = ρ y x xy = \rho {yx} and we call x , y x,y a skew commuting pairs. The connection mentioned above is between the Galois structure of the three torsion points E [ 3 ] E[3] and the Galois structure of skew commuting pairs in extensions D F K D \otimes _F K . Given a description of which E E arise, we then describe, via Galois cohomology, which C C arise.

Publisher

American Mathematical Society

Reference9 articles.

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3. Classical Algebraic Geometry

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