Stephan Ehlen

Stephan Ehlen

CRM-ISM Postdoctoral Fellow

Office: 1242 Burnside Hall
Department of Mathematics and Statistics
McGill University
805 Sherbrooke St. West
Montreal, Quebec
Canada H3A 0B9
Email: mail [at]

Research and Interests

  • Number Theory
  • Modular Forms, Automorphic Forms


  • On two arithmetic theta lifts (with Siddarth Sankaran), arXiv
  • Regularized inner products and errors of modularity (with K. Bringmann and N. Diamantis), arXiv
  • Singular moduli of higher level and special cycles, Research in the Mathematical Sciences (2015), arXiv
  • Vector valued theta functions associated with binary quadratic forms, accepted for publication in Forum Mathematicum (2015), arXiv
  • CM values of regularized theta lifts, preprint (2014), submitted
  • Lattices with many Borcherds products, with J. H. Bruinier and E. Freitag, Math. of. Comp., to appear, arXiv
  • Thesis: CM values of regularized theta lifts (2013), tuprints
  • On CM values of Borcherds products and harmonic weak Maass forms of weight one, preprint (2012), arXiv
  • Twisted Traces of CM values of weak Maass forms (with C. Alfes), J. Number Theory 133 (2013), no. 6. arXivcomputations
  • Twisted Borcherds products on Hilbert modular surfaces and the regularized theta lift, Int. J. Number Theory 6 (2010), no. 7, 1473-1489. 


Conferences and Seminars

Research Seminar Darmstadt-Frankfurt: Superstarrheit und Arithmetizität (SS 13), Arakelov-Theorie (WS 12/13), Selbergs 3/16 Theorem (SS 12)