Promotor: W.Th.F. den Hollander

Promotores: W. Th. F. den Hollander, M.O. Heydenreich

Promotor: Promotor: W.Th.F. den Hollander, Co-promotor: V. Sidoravicius.

This thesis investigates opinion dynamics on random graphs through the lens of the voter model, a classical interacting particle system used to describe how consensus emerges in networks.

The thesis mainly contributes to the characterization of Majorana fermions as they appear in the Condensed Matter context.

The main topic of this PhD thesis is the Arakelov ray class group of a number field, an algebraic object that contains both the ideal class group structure and the unit group structure.

This thesis is divided into two parts. In Part I we study metastability properties of queue-based random-access protocols for wireless networks. The network is modeledas a bipartite graph whose edges represent interference constraints. In Part II we study spectra of inhomogeneous Erdős-Rényi random…

This dissertation consists of two parts, each of which considers a different research area related to random interval maps. In the first part we are interested in random interval maps that are critically intermittent.

The aim of this thesis is to present novel techniques for proving cryptographic schemes secure against quantum adversaries. Most results are within the context of an idealized model called the ‘quantum random-oracle model’.

This dissertation presents four separate chapters, all striving towards the same goal: to understand dynamic phenomena occurring in dynamic networks and to explore the emergence of equilibrium in a broad sense.

I am Sijmen Wals and this semester I'll be the new intern at the Netherlands-Flemish Institute in Cairo.

This dissertation consists of two parts, with the common theme

He brings order to chaos and analyses satellite swarms. During his PhD research, mathematician Oliver Nagy delved into random networks and how they reach equilibrium. Along the way, he also developed a handy tool. This knowledge is valuable for calculations related to communication networks.

The parabolic Anderson model (PAM), which is the Cauchy problem for the heat equation with random potential. The PAM is a mathematical model that describes how mass (i.e. matter or energy) flows in a medium in the presence of a field of sources and sinks.

The transition period in which men become fathers might provide an important window of opportunity for parenting interventions that may produce long-term positive effects on paternal care and, consequently, child development. Existing prenatal programs traditionally focus on maternal and infant health…

PhD defence

Mathematician Oliver Nagy still vividly remembers the first time he learned about a random walk. ‘The lecturer told us to imagine a company of drunken students who wander in the streets. At each intersection, they would spin one of them around and all would go in the direction where he or she came to…

Zeger van der Wal, Professor by special appointment Ien Dales chair at the Institute of Public Administration wrote an opinion piece in Dutch journal Binnenlands Bestuur on the changing relation between government and society and how this affects integrity.

For associate professor Jenneke van der Wal, things have been good recently. After being awarded a Vici and Una Europa grant, she has now also received an Ammodo Science Award. ‘It is a nice confirmation that I am doing valuable work.’

Managers in the public and semi-public sector work in an increasingly complex and unpredictable environment, which demands new knowledge and competences but also offers tremendous opportunities. This was the view presented by Zeger van der Wal, professor by special appointment in Public Administration…

This thesis explores Breaking of Ensemble Equivalence (BEE) in random graph models by examining the spectral properties of adjacency matrices. The goal is to identify spectral characteristics that differentiate random graph ensembles, enhancing the understanding of complex network structures and beh…

Promotor: V. Vitelli, Co-promotor: J. Paulose

On Thursday 28 September 2017 the Institute of Public Administration of the Faculty of Governance and Global Affairs (FGGA) organizes the event ‘Good Governance in Asia and the West: What is the Difference?’ as part of the Leiden Asia Year. Below you can read the interview with professor Zeger van der…

'The kind of knowledge you gain in International Studies can take you anywhere,' says Gaby van de Wal (26, The Hague, The Netherlands), who graduated from the programme in 2018. Her own career path is proof that indeed, an International Studies degree comes with many opportunities.

This thesis explores Breaking of Ensemble Equivalence (BEE) in random graph models by examining the spectral properties of adjacency matrices. The goal is to identify spectral characteristics that differentiate random graph ensembles, enhancing the understanding of complex network structures and beh…

Anne Marieke van der Wal-Rémy, assistant professor of African History and International Studies, has received a Comenius Teaching Fellow grant of 50,000 euros. She intends to use the grant to set up an online archive of digital primary sources, together with her students. Van der Wal-Rémy: ‘ “Once on…

Plants and their pollinators form complex interaction networks. Within these networks, species differ widely in the number of species they interact with.

We found that, next to the effectiveness of the intervention, it’s also very likely that the intervention is cost-effective compared to attention only.

In this thesis,

Promoter: J.G.E.M.Fraaije, Co-promotor: A. Kros

Linguistic research on a unique collection of Dutch letters allowed us to gain access to the every-day language of people from various walks of life. Private letters by men, women and even children have been elaborately explored in the Letters as Loot researchprogramme, initiated and directed by prof.…

Promotor: C.W.J. Beenakker, Co-promotor: M.T. Wimmer

Promotor: Richard D. Gill

From 2 to 6 June 2014, Prof. dr. Frank den Hollander has provided 2 lectures during the workshop ‘Recent Models in Random Media’ at the Centre International de Rencontres Mathematique in Marseille (CIRM). This center facilitates workshops for mathematicians throughout the year.

How do you study the growth of microorganisms, the spread of epidemic diseases or the healing of wounds, without actually performing experiments? Daoyi Wang, PhD candidate at the Mathematical Institute, worked on a specific mathematical model that can describe the growth of microorganisms and many other…

Nina Komrij works as a postdoctoral researcher at the Developmental and Educational Psychology unit of the Institute of Psychology at Leiden University.

The information below concerns courses that our group teaches in Leiden. 

Research in the POD-group addresses all features of random phenomena – modelling, structuring, analysis, control, optimisation – and covers both fundamental and applied aspects.