Promotores: Prof.dr. J. Schaye, Prof.dr. S.D.M. White (MPA Garching)

The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters.

The MOOC Terrorism and Counterterrorism: Comparing Theory & Practice was one of the first MOOCs of Leiden University to go live back in September 2013. More than three years have passed and the MOOC has attracted over 100,000 people coming from more than 100 countries.

Promotores: S.F. Portegies Zwart, E. M. Rossi

Promotor: K. Kuijken, Co-Promotor: H. Hoekstra

In this thesis we investigate cosmology and the large scale structure of the Universe using cosmological simulations.

Through the clever use of two types of telescopes, a team of researchers has produced stunning images of clusters of galaxies. This not only produces beautiful images, but also provides more information about the enormous amounts of energy released around supermassive black holes in clusters. The astronomers,…

This project compares and explains dynamics of cross-border cooperation among European actors in the field of counterterrorism (CT).

On 12 September 2024, the official ceremony opening the academic year 24-25 for students of the European Law master’s programme took place at Leiden Law School, organised by the Europa Institute.

The United States and the European Union need to work together more closely in the field of the law to fight terrorists and criminals who are operating increasingly internationally. This was the advice given by American Minister of Justice Loretta Lynch during her visit to Leiden University on 1 Jun…

This article explores how ISIS and the Taliban have fostered support through their parallel legal systems.

In this thesis it is posed that the central object of preference discovery is a co-creative process in which the Other can be represented by a machine. It explores efficient methods to enhance introverted intuition using extraverted intuition's communication lines.

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

Three major cosmology-focused missions are planned for the next decade: the Euclid space telescope, the Vera C. Rubin Observatory in Chile, and the Nancy Grace Roman Space Telescope.

This thesis utilises the exceptional sensitivity and resolution of LOFAR to explore the low-frequency Universe, while simultaneously advancing the telescope's capabilities to enable new scientific discovery.

Promotor: A. Achúcarro Co-promotor: A. Boyarsky

The project examines the political conflict in the Red River Valley of Louisiana between the majority-black Republican Party and the overwhelmingly white Democratic Party by studying the composition and actions of each party.

Nowadays, it is well known that hydrogen and helium (and small traces of lithium and beryllium) were created shortly after the Big Bang, while the heavier elements are created in the cores of stars at different evolutionary stages. When these stars explode as supernovae, they expel metals synthesised…

Bart Schuurman is a research Fellow at the International Centre for Counterterrorism (ICCT) and at the Institute of Security and Global Affairs (ISGA) in The Hague. He was interviewed by Abigail Esman of the Investigative Project on Terrorism (IPT) about his new book 'Becoming A European Homegrown Jihadist'.…

Promotor: Prof.dr. S.F. Portegies Zwart

Subproject of

Subproject of

OB associations are loose groups of young, massive stars. They constitute the last stage of the massive starformation process, and the context in which new stars are formed.

People already diagnosed with a mental disorder before the COVID-19 pandemic did not show a disproportionate increase in symptoms afterwards. This is one result from the first systematic review of longitudinal studies following their study population from before to during the first eighteen months of…

At the largest scales, two ingredients dictate the distribution of matter in the Universe. The first is dark matter, acting as an invisible scaffolding held together by gravitational forces.

Promotor: Prof.dr. G.P. van Wezel

Supervisor: S.F. Portegies Zwart Co-Supervisor: A.G.A. Brown

The increasing resistance of pathogenic bacteria to antibiotics necessitates the discovery of new medicines.

Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems.

Soil is a home for an unbelievable diversity and abundance of microbial life that is essential for supporting life on our planet.

Promotor: G.P. van Wezel, Co-promotor: Y.H. Choi

Jeanine de Roy van Zuijdewijn was invited to give the subject matter expert speech during the plenary meeting of the working groups of the Global Coalition against Daesh in Copenhagen on 28 January 2020.

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

Although Islamic State has largely been beaten, for now the Jihad scene in the Netherlands is more than alive. That is what professor Edwin Bakker (terrorism and counterterrorism) recently said in an interview in the Algemeen Dagblad.

The Terrorism and Political Violence (TPV) research group focuses on understanding and addressing one of today’s most pressing security challenges: terrorism. Drawing from their academic expertise, the group offers a wide range of educational programmes designed for students, professionals, and a global…

In the Master's programme Crisis and Security Management, specialisation Terrorism and Political Violence, we focus on the academic body of knowledge on different form of protests, contention, resistance and violence. We explore and explain the emergence of radical and extremist movement.

On February 7th, Lotte Dros-Hendriks succesfully defended her doctoral thesis and graduated. The Leiden University Centre for Linguistics congratulates Lotte on this great result.

The origin and evolution of galaxies are closely tied to the cyclic feedback processes between stars and the interstellar medium (ISM).

Actinobacteria are Gram-positive bacteria that have a complex multicellular life cycle and are well known for their ability to produce a wide range of bioactive natural products (NPs).

Marieke Liem en Edwin Bakker have published an article in the Dutch Magazine Criminology. The article tells us the following:

The Modern and Contemporary Cluster is the largest within LUCAS and home to more than 100 staff members and PhD candidates. Hosting a diverse group of young and advanced scholars, it offers an especially fruitful and dynamic environment for interdisciplinary collaboration.

This research project explores themes related to the system of close protection and surveillance (Dutch: bewaken en beveiligen) in the Netherlands.