There are a number of problems in philosophy that seem to share a similar possible solution: 'Why do promises and contracts bind?', 'Why ought citizens and judges obey the law?' and 'Can we realize the gains to be made from cooperation?'. All three problems (as well as some others) share a possible…

An interdisciplinary cultural analysis of how the Hindustani double migration informs contemporary processes of identification and problematises the juxtaposition of tradition and modernity.

This thesis examines the complexity of legislative decisions within the EU, with a specific focus on the Council of the EU.

Heterogeneous catalysis is one of the fundamental processes of modern life, being common in industrial refinery and hydrogen vehicles, all the way to the living cell. The dissociation of H2 on Cu(111) is an important benchmark system for studying heterogeneous catalysis, with a large and varied amount…

The overarching clinical aim of this thesis was to improve pharmacological pain management by characterizing the pharmacodynamics of analgesics.

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…

Leiden chemists have proposed a new model for enzymatic reactions, in which the flexibility of the substrate is much more important than previously thought. Their results are paradigm-shifting and could have major implications for drug research and enzyme engineering. Publication in Angewandte Chemi…

Second-year MIRD students showcase their thesis research on global issues during the 2025 Thesis Symposium, bridging theory and diplomatic practice.

The 18th-century rediscovery of the three archaic Greek-Doric temples in Paestum in southern Italy turned existing ideas on classical architecture upside down...

Elise Darras studeert aan het Leiden University College (LUC) en be besloot een maand lang stage te lopen in Frankrijk bij H2Air.

During last summer, the Faculty of Law offered an Honours Class about the theme 'Governing Crime and Migration'. Hillary Mellinger, one of the participating international students, tells us about her experiences.

A semi-empirical version of the specific reaction parameter approach to density functional theory (SRP-DFT) has been remarkably successful at predicting dissociative chemisorption probability vs. incidence energy curves for reactions on metal surfaces. New quantum Monte Carlo (QMC) calculations on the…

In June of this year, LL.M student Matthijs de Meer visited the East African Court of Justice for an internship.

Promotor: W.Th.F. den Hollander Co-Promotor: F.M. Spieksma

Promotor: Prof.dr. A. Achucarro, Co-Promotor: J.W. van Holten

In this thesis we study the landscape of gravitational models which modify GR by introducing an additional scalar degree of freedom (d.o.f.) to source Cosmic Acceleration.

This thesis is dedicated to the exploration of the primordial dark ages: unknown physics during the earliest stages of the Universe’s expansion that have not yet been directly probed by observations. Cosmic inflation is a burst of exponential expansion of space after the “Big Bang”.

Promotor: A. Doelman, Co-promotores: P.J.A. van Heijster; A. Zagaris

Promotor: F. Arbab, R. De Nicola, Co-Promotor: M. Tribastone

This dissertation focused on computational methods based on first principles calculations using the Density Functional Theory (DFT) framework. Emphasis was laid on affordable methods that can provide a tradeoff between computational expense and accuracy.

Artin L-functions associated to continuous representations of the absolute Galois group G_K of a global field K capture a lot of information about G_K as well as arithmetic properties of K.

Promotores: P. Stevenhagen, E. Fouvry (Univeriste Paris Saclay)

The Encyclopedia of Global Human Migration provides a complete exploration of the prominent themes, events, and theoretical underpinnings of the movements of human populations from prehistory to the present day.

Promotor: Prof.dr. P. Stevenhagen & Prof.dr. K. Belabas (Univ. de Bordeaux)

In this thesis,

To an algebraic curve C over the complex numbers one can associate a non-negative integer g, the genus, as a measure of its complexity.

In ‘Dimensions of Free Speech’, Devrim Kabasakal Badamchi (Leiden University Institute of Political Science) offers a new theoretical framework for free speech by critically analysing the major justifications for free speech. Kabasakal Badamchi argues for a justification: namely the double-grounded…

Political scientists Huib Pellikaan and Niels van Willigen (Leiden University) use and elaborate on the theoretical insights from game theory in order to understand nuclear security in changing environment. Now that the relations between the US and Russia have deteriorated and smaller nuclear states…

Promotor: A. Doelman, Co-promotor: M.F.E. de Jeu

Promotor: Robert Tijdeman, Co-promotor: Cornelis Kraaikamp

Chapter 1,contains the numerical verification of the Birch and Swinnerton-Dyer conjecture for hundreds of Jacobians of hyperelliptic curves of genus 2, 3, 4 and 5.

Promotor: G. J. Kroes