Limits of traces of singular moduli

Dohoon Choi, Subong Lim

Research output: Contribution to journalArticlepeer-review


Let f and g be weakly holomorphic modular functions on Γ0(N) with the trivial character. For an integer d, let Trd(f) denote the modular trace of f of index d. Let r be a rational number equivalent to i∞ under the action of Γ0(4N). In this paper, we prove that when z goes radially to r, the limit QH (f)(r) of the sum H(f)(z) =Σd>0 Trd(f)e2πidz is a special value of a regularized twisted L-function defined by Trd(f) for d ≤ 0. It is proved that the regularized L-function is meromorphic on C and satisfies a certain functional equation. Finally, under the assumption that N is square free, we prove that if QH(f)(r) = QH (g)(r) for all r equivalent to i∞ under the action of Γ0(4N), then Trd(f) = Trd(g) for all integers d.

Original languageEnglish
Pages (from-to)185-227
Number of pages43
JournalTransactions of the American Mathematical Society
Issue number1
Publication statusPublished - 2020

Bibliographical note

Publisher Copyright:
© 2019 American Mathematical Society.


  • Eichler-Shimura cohomology theory
  • Modular traces
  • Regularized L-functions

ASJC Scopus subject areas

  • General Mathematics
  • Applied Mathematics


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