Sonja Žunar Kožić

University of Zagreb
Faculty of Geodesy
Kačićeva 26, 10000 Zagreb, Croatia

sonja.zunar@geof.unizg.hr

Welcome!

I am an assistant professor of mathematics at the Faculty of Geodesy, University of Zagreb. My main research interests are automorphic forms and representation theory.

Research

Preprints

• Žunar Kožić, S.: A lower bound on the relative L¹-norm of Poincaré series. Accepted for publication in Glas. Mat. Ser. III

Papers

• Žunar, S.: On the non-vanishing of Poincaré series on irreducible bounded symmetric domains. Int. J. Number Theory 21(10), 2255–2280 (2025)
  DOI: 10.1142/S1793042125501106
  Preprint: arXiv:2501.06876
• Žunar, S.: Orthogonality relations for Poincaré series. Math. Commun. 30(2), 161–169 (2025)
  DOI: 10.64785/mc.30.2.1
  Preprint: arXiv:2501.17832
• Žunar, S.: Construction and non-vanishing of a family of vector-valued Siegel Poincaré series. J. Number Theory 268, 95–123 (2025)
  DOI: 10.1016/j.jnt.2024.09.007
  Preprint: arXiv:2405.02966
• Grobner, H., Žunar, S.: On the notion of the parabolic and the cuspidal support of smooth-automorphic forms and smooth-automorphic representations. Monatsh. Math. 204, 455–500 (2024)
  DOI: 10.1007/s00605-024-01965-z
  Preprint: arXiv:2108.06369
• Žunar, S.: On a family of Siegel Poincaré series. Int. J. Number Theory 19(9), 2215-2239 (2023)
  DOI: 10.1142/S1793042123501087
  Preprint: arXiv:2210.07192
• Žunar, S.: Non-vanishing of vector-valued Poincaré series. J. Number Theory 224, 217–242 (2021)
  DOI: 10.1016/j.jnt.2021.01.007
  Preprint: arXiv:2007.16159
• Muić, G., Žunar, S.: On the Schwartz space S(G(k)\G(A)). Monatsh. Math. 192(3), 677–720 (2020)
  DOI: 10.1007/s00605-020-01407-6
  Preprint: arXiv:1905.00876v2
• Žunar, S.: On the non-vanishing of L-functions associated to cusp forms of half-integral weight. Ramanujan J. 51(3), 455–477 (2020)
  DOI: 10.1007/s11139-019-00135-2
  Preprint: arXiv:1809.10390
• Žunar, S.: On the non-vanishing of Poincaré series on the metaplectic group. Manuscripta Math. 158(1–2), 1–19 (2019)
  DOI: 10.1007/s00229-018-1011-6
  Preprint: arXiv:1711.06481
• Žunar, S.: On Poincaré series of half-integral weight. Glas. Mat. Ser. III 53(2), 239–264 (2018)
  DOI: 10.3336/gm.53.2.03
  Preprint: arXiv:1711.07281

Chapters

• Žunar, S.: A note on the non-vanishing of Poincaré series. Women in numbers Europe IV—research directions in number theory, Assoc. Women Math. Ser. 32, Springer, Cham, 353-369 (2024)
  DOI: 10.1007/978-3-031-52163-8_12

Research Projects

Ongoing:

• Institutional research project Modular forms, unitary representations, and numerical methods (Modular-FUN) of the University of Zagreb Faculty of Geodesy, supported by the European Union – NextGenerationEU through the National Recovery and Resilience Plan 2021–2026 – principal investigator 2025–2029
• Croatian Science Foundation research project Spaces of modular and automorphic forms and representation theory within the framework of the Langlands program (SMART-Langlands) – team member 2023–2027

Completed:

• Croatian Science Foundation research project Unitary representations, automorphic and modular forms – team member (postdoctoral researcher 2019–2022)
• Croatian Science Foundation grant Automorphic forms, representations and applications – team member (doctoral researcher 2015–2018)

Teaching

Courses

Mathematical Analysis

2.

• Obligatory course in the first semester of the Undergraduate Study Programme in Geodesy and Geoinformatics
• 5 ECTS
• Course coordinator since the academic year 2022/23

Vector Analysis

2.

• Obligatory course in the second semester of the Undergraduate Study Programme in Geodesy and Geoinformatics
• 3 ECTS
• Course coordinator since the academic year 2021/22

Complex Analysis

2.

• Elective course in the first semester of the Graduate Study Programme in Geodesy and Geoinformatics
• 6 ECTS
• Course coordinator since the academic year 2023/24

Numerical Analysis

2.

• Elective course in the second semester of the Graduate Study Programme in Geodesy and Geoinformatics
• 6 ECTS
• Course coordinator since the academic year 2023/24

Curriculum Vitae

Click here for a PDF version of my CV.