Quotients of hyperelliptic curves and Étale cohomology

Tim Dokchitser, Vladimir Dokchitser*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)
234 Downloads (Pure)


We study hyperelliptic curves C with an action of an affine group of automorphisms G. We establish a closed form expression for the quotient curve C/G and for the first étale cohomology group of C as a representation of G. The motivation comes from the arithmetic of hyperelliptic curves over local fields, specifically their local Galois representations and the associated invariants.

Original languageEnglish
Pages (from-to)747-768
Number of pages22
JournalQuarterly Journal of Mathematics
Issue number2
Early online date8 Feb 2018
Publication statusPublished - 1 Jun 2018


  • hyperelliptic curves
  • quotient curves
  • etale cohomology
  • Galois representations


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