About Me

Research

Teaching

CV

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. Preprint (2026)

1.

… a future link …

Papers

Žunar, S.: On the non-vanishing of Poincaré series on irreducible bounded symmetric domains. Int. J. Number Theory 21(10), 2255–2280 (2025)

1.

DOI: https://doi.org/10.1142/S1793042125501106

Preprint: arXiv:2501.06876

Žunar, S.: Orthogonality relations for Poincaré series. Math. Commun. 30(2), 161–169 (2025)

1.

DOI: https://doi.org/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)

1.

DOI: https://doi.org/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)

2.

DOI: https://doi.org/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)

2.

DOI: https://doi.org/10.1142/S1793042123501087

Preprint: arXiv:2210.07192

Žunar, S.: Non-vanishing of vector-valued Poincaré series. J. Number Theory 224, 217–242 (2021)

2.

DOI: https://doi.org/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)

2.

DOI: https://doi.org/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, 455–477 (2020)

2.

DOI: https://doi.org/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)

2.

DOI: https://doi.org/10.1007/s00229-018-1011-6

Preprint: arXiv:1711.06481

Žunar, S.: On Poincaré series of half-integral weight. Glas. Mat. 53(2), 239–264 (2018)

2.

DOI: https://doi.org/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)

2.

DOI: https://doi.org/10.1007/978-3-031-52163-8_12

Research Projects

Ongoing:

Institutional grant “Modular forms, unitary representations, and numerical methods” (Modular-FUN) – principal investigator

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  • Institutional research grant of the University of Zagreb – Faculty of Geodesy, supported by the European Union – NextGenerationEU through the National Recovery and Resilience Plan 2021–2026
  • Start: 01/10/2025. End: 30/09/2029.
  • Project website: modular-fun.geof.hr
Croatian Science Foundation grant “Spaces of modular and automorphic forms and representation theory within the framework of the Langlands program” (SMART-Langlands) – team member

2.

  • Croatian Science Foundation research grant no. IP-2022-10-4615
  • Principal investigator: Neven Grbac, Juraj Dobrila University of Pula
  • Start: 15/12/2023. End: 14/12/2027.

Completed:

Croatian Science Foundation grant “Unitary representations, automorphic and modular forms” – team member (postdoctoral researcher)

2.

  • Croatian Science Foundation research grant no. IP-2018-01-3628
  • Principal Investigator: Marcela Hanzer, University of Zagreb, Department of Mathematics
  • Start: 09/10/2018. End: 08/10/2022.
Croatian Science Foundation grant “Automorphic forms, representations and applications” – team member (doctoral researcher)

2.

  • Croatian Science Foundation research grant no. IP-2013-11-9364
  • Principal Investigator: Goran Muić, University of Zagreb, Department of Mathematics
  • Start: 01/07/2014. End: 30/06/2018.

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.