Eigenform product identities for Hilbert modular forms

Kirti Joshi, Yichao Zhang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We prove that amongst all real quadratic fields and all spaces of Hilbert modular forms of full level and of weight 2 or greater, the product of two Hecke eigenforms is not a Hecke eigenform except for finitely many real quadratic fields and finitely many weights. We show that for Q(5) there are exactly two such identities.

Original languageEnglish (US)
Pages (from-to)1161-1179
Number of pages19
JournalMathematische Zeitschrift
Issue number3-4
StatePublished - Dec 1 2019


  • Hecke eigenform
  • Hilbert modular form
  • Product identity

ASJC Scopus subject areas

  • General Mathematics


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