On Prym varieties for the coverings of some singular plane curves

Lubjana Beshaj, Takuya Yamauchi

Research output: Contribution to journalArticlepeer-review


Let k be a field of characteristic zero containing a primitive nth root of unity. Let Cn0 be a singular plane curve of degree n over k admitting an order n automorphism, n nodes as the singularities, and Cn be its normalization. In this paper we study the factors of Prym variety Prym(C~n/Cn) associated to the double cover C~ n of Cn exactly ramified at the points obtained by the blow-up of the singularities. We provide explicit models of some algebraic curves related to the construction of Prym(C~n/Cn) as a Prym variety and determine the interesting simple factors other than elliptic curves or hyperelliptic curves with small genus which come up in Jn so that the endomorphism rings contains the totally real field Q(ζn+ζn-1).

Original languageEnglish
Pages (from-to)205-222
Number of pages18
JournalManuscripta Mathematica
Issue number1-2
Publication statusPublished - 2019 Jan 7


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