‘What I find most alluring about soil life is that you can steer it,’ researcher Martijn Bezemer of the Institute Biology Leiden (IBL) reveals. ‘You can ask: What do you want? And then I can transform the soil into something you need. At least, that is what we thought.’

This thesis contributes to studying primordial cosmology theories and their detectability in future observations.

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”.

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.

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

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.

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

Using mathematics to determine whether scientific results are significant or not. Peter Grünwald, full professor of Statistical Learning at the Mathematical Institute (MI) and senior researcher in the Machine Learning group of Centrum Wiskunde & Informatica (CWI), has been awarded an ERC Advanced Grant…

Every summer, Leiden University is the setting of dozens of summer schools in which professionals and students can receive extra training on a specific topic within a short space of time. We took a look at a summer programme on extremism. ‘A recruiter for al-Qaeda said that I could change the world.…

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…

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

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

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 this thesis,

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)

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…

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…

Jelle van Buuren, Assistant Professor at the Institute of Security and Global Affairs, appeared as guest on VICE to discuss the usefulness of recent ban on QAnon.

'The way we consume information has changed dramatically over the past fifteen years. You're no longer just a receiver; you participate, create, and spread information. So why not use that to improve society?'

During the final meeting of the Thesis Project on 10 February at 'Pand Zuidwest' in The Hague, several students presented their theses. Students from different disciplines conduct research on formulated practice-oriented challenges in The Hague South-West. 'The Thesis Project provides a connection between…

Professor Edwin Bakker, director of the Centre for Terrorism & Counterterrorism, released his new book “Terrorism and Counterterrorism Studies: Comparing Theory and Practice”, published by Leiden University Press.

Dr Anouk Goemans has been appointed professor by special appointment of Youth Services and Child Protection from an Educational and Legal Perspective as of 1 November 2024. This chair is funded by the 'Stichting Steunfonds Pro Juventute' support fund foundation and serves as a bridge between the Department…

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

Promotor: Ronald Cramer, Co-promotor: Serge Fehr

The most recent edition of the journal ‘The Theory and Practice of Legislation’ contains a contribution by Jelle But, Demy Jongkind and Wim Voermans.

Fundamental understanding of molecular reactions on metal surfaces is important for improving heterogeneous catalysis.

Jelle van Buuren, Assistant Professor at the Institute of Security and Global Affairs at Leiden University, can be heard in the latest Podcast of Wetenschap.nu.

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

In the spirit of 'unity in diversity', our objective is to promote insight into and appreciation for the wonder that the same physical laws and mathematical concepts apply to the whole of nature, from the largest to the smallest energy and length scales. We strive for the application of abstract theoretical…

This thesis studies operator-algebraic aspects of subproduct systems, a generalization of product systems of Hilbert spaces.

Everyone has heard arguments like this before as a child: ‘Whether you like it or not, you have to go to school!’ It seems as though you are presented with two options, but there is only one real outcome. Charlotte van der Voort of the MA Dutch Studies won the Leiden University Thesis Prize on her research…

Bringing the theoretical world of mathematics and computer science to more applied research areas. That is what Daan Pelt, assistant professor at the Leiden Institute of Advanced Computer Science (LIACS) is trying to achieve with the methods he is developing as a solution to challenges in image proc…

Promotor: S.M. Verduyn Lunel, Co-Promotor: O.W. van Gaans

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

Promotor: G. J. Kroes

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.

This subproject of 'From Homo Economicus to Political Animal' analyzes Greek economic thinking of the Hellenistic period.

Most of current public-key cryptography is considered insecure against attacks from sufficiently powerful quantum computers. Post-quantum cryptography studies methods to secure information resistant against such attacks. One proposal is isogeny-based cryptography, which bases its security on computational…