On twists of smooth plane curves

Eslam Badr, Francesc Bars, Elisa Lorenzo García

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)


© 2018 American Mathematical Society. Given a smooth curve defined over a field k that admits a nonsingular plane model over k, a fixed separable closure of k, it does not necessarily have a non-singular plane model defined over the field k. We determine under which conditions this happens and we show an example of such phenomenon: a curve defined over k admitting plane models but none defined over k. Now, even assuming that such a smooth plane model exists, we wonder about the existence of non-singular plane models over k for its twists. We characterize twists possessing such models and we also show an example of a twist not admitting any non-singular plane model over k. As a consequence, we get explicit equations for a non-trivial Brauer-Severi surface. Finally, we obtain a theoretical result to describe all the twists of smooth plane curves with cyclic automorphism group having a model defined over k whose automorphism group is generated by a diagonal matrix.
Original languageEnglish
Pages (from-to)421-438
JournalMathematics of Computation
Issue number315
Publication statusPublished - 1 Jan 2018


  • Automorphism groups
  • Non-singular plane curves
  • Twist


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