Published June 18, 2026
At its annual meeting in Frankfurt, the Max Planck Society honored Giulio Zucal as one of its best junior scientists with the 2025 Otto Hahn Medal. This prestigious award recognizes his fundamental and innovative contributions to the study of graphs and hypergraphs during his doctoral research. We warmly congratulate him on this great achievement.
Giulio completed his PhD in the research groups of Raffaella Mulas and Jürgen Jost, who jointly supervised his doctoral thesis. Now, he works as an ELBE postdoctoral fellow at the Center for Systems Biology Dresden, a joint initiative of the Max Planck Institute of Molecular Cell Biology and Genetics and the Max Planck Institute for the Physics of Complex Systems.
His research focuses on mathematics and its applications to biology and data science using techniques from analysis, probability, combinatorics and geometry. His PhD dissertation tackled some of the most challenging problems at the intersection of mathematics and network science. He developed rigorous mathematical tools to study the structure and underlying geometry of networks, using a combination of continuous and discrete methods. His research spans several key areas: spectral graph theory, discrete Ricci curvatures, and graph/hypergraph limit theory.
This is how he summarizes his key contributions:
“First, we advance the understanding of the spectrum and eigenfunctions of the non-backtracking Laplacian, a recently introduced Laplace operator for graphs that is related to non-backtracking random walks. Second, we address the problem of constructing graphs with a specified discrete Ricci curvature and explore the space of such graphs. In particular, we derive a finite set of rewiring moves that connects the space of all graphs with a given Forman-Ricci curvature and degree sequence.
Finally, as the main mathematical contribution, we extend graph limit theory by developing new notions of convergence and limits for sequences of graphs and generalizations. Specifically, we study two concepts of edge-decorated graph limits, probability graphons and P-variables, showing several properties of these objects and proving the equivalence of these two frameworks. Additionally, we develop limit theories for hypergraphs, higher-order generalizations of graphs, and analyze their properties. “
Every year since 1978, the Max Planck Society has awarded the Otto Hahn Medal to up to 30 young researchers for outstanding scientific achievements, primarily in connection with their doctorates. The medal is endowed with 7,500 euros of prize money and is intended to encourage them to pursue a scientific career.
"I would like to thank all the amazing people who helped me through my PhD journey: my family, friends, supervisors, mentors and collaborators. Their constant support, combined with the inspiring environment at MPI MiS, made this award possible.” Giulio Zucal
Max Planck Institute of Molecular Cell Biology and Genetics
E-Mail
PhD thesis
Continuous methods for discrete structures, 2025.
Information about the Otto Hahn Medal and all 2026 awardees