This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.

Promotor: Prof.dr. H.W. Lenstra

An international team of researchers led by Leiden University (the Netherlands) has mapped nine gigantic collisions of galaxy clusters. The collisions took place seven billion years ago and could be observed because they accelerate particles to high speeds. It is the first time that collisions of such…

The unit residue group, to which the present thesis is devoted, is defined using the norm-residue symbol, which Hilbert introduced into algebraic number theory in 1897.

Where did the new generation of antislavery activists get their inspiration to organize in large-scale pressure groups?

Media all around the world reported about it: the most detailed images yet seen of galaxies, shot by radio telescope LOFAR. The international team behind these amazing results were led by Leah Morabito at Durham University and included three talented Leiden astronomers.

ESA’s Gaia mission has produced the richest star catalogue to date, including high-precision measurements of nearly 1.7 billion stars and revealing previously unseen details of our home Galaxy.

Three Leiden researchers have been awarded a Vici grant by the Dutch Research Council. The funding of up to 1.5 million euros supports ‘talented, adventurous and pioneering researchers’. A total of 39 projects at Dutch institutions will receive a grant.

What legislative and regulatory questions arise when children, adolescents or elderly people use the Internet?

Promotor: Prof. dr. A.G.G.M. Tielens

Promotores: Prof.dr. A.G.G.M. Tielens & Prof.dr. L. Kaper (UvA)

Promotor: W. Jaffe, Co-promotor: K. Meisenheimer

Tracing the evolution of the molecular gas content in galaxies is critical for a complete understanding of galaxy formation and evolution, as it provides the direct fuel for star formation. Studies of high-redshift (z>1) molecular gas reservoirs, most commonly traced by carbon monoxide (CO), have seen…

Promotor: E. Gittenberger, Co-promotores: B.W. Hoeksema; L.P. van Ofwegen

The following people are part of the Academia in Motion Steering Group.

This book focuses on policing in city-regions in Europe bringing together experts from across the continent to develop a sociology of urban policing and a unique methodology for comparing different metropolises in the same country.

Strategic direction of the GTGC initiative lies with a Steering Group, composed of seven members from four Leiden University faculties. Chaired by Leiden's Professor of Global Transformations and Governance Challenges, the Steering Group addresses questions such as overall vision, staffing, communications,…

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

Researchers have discovered oxygen in the furthest known galaxy JADES-GS-z14-0. Leiden astronomers Sander Schouws and Rychard Bouwens were part of the team that made this discovery. This news was reported in all newspapers and online media.

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.

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

Over a seven year period an international team of scientists has mapped more than a quarter of the northern sky using the Low Frequency Array (LOFAR), a pan-European radio telescope. From Leiden, Astronomer Timothy Shimwell and Huub Röttgering, among others, are involved. It reveals an astonishingly…

Promotor: P. Stevenhagen, Co-promotores: B. de Smit, F. Andreatta

Promotores: H.W. Lenstra, A. Lucchini

On 14 November, Ilya Kokorin defended the thesis 'Intra-group financing and enterprise group insolvency: problems, principles and solutions'. The doctoral research was supervised by Matthias Haentjens and Reinout Vriesendorp.

Healthy University Leiden was founded by working with a taskforce, a focus group and seminars.

Several so-called Special Interest Groups are linked to DSRP. These groups focus on specialized topics and organize their own group meetings, talks etc. Contact the group leader if you are interested to join. It is possible to be a member of multiple groups.

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

Stellar feedback is a crucial ingredient in the evolution of galaxies.

How and when do interest groups organise themselves as transmission belts and what are the implications for their political relevance among public officials involved decision-making processes?

Louk Rademaker is visiting fellow at Leiden University, Lorentz Institute for Theoretical Physics. He studies theoretical quantum matter physics, connecting the material science to fundamental concepts and methods.

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,…

The Faculty of Humanities has two advisory groups for Diversty & Inclusion: one for staff members and one for students.

The purpose of eLaw's Working Groups is to stimulate a productive working environment for cooperation within the Center for Law and Digital Technologies at Leiden University.

The research group of Silke Henkes at Leiden University. Part of the Leiden Institute of Physics (LION). The group studies the physics opf active materials.

Freshwater and brackish water ecosystems are arguably the most vulnerable ecosystems on earth, due to concentrated human developments in and around them. The Pontocaspian (PC) region located at the border of Europe and Asia contains a variety of brackish water ecosystems and unique inhabitants, known…

Embracing the Provinces is a collection of essays focused on people and their daily lives living in the Roman provinces, c. 27 BC-AD 476. It offers an overview of current research on Roman provinces and frontiers, deconstructing some long-held preconceptions and providing refreshing insights into unexplored…

The Sustainability in Education group is a diverse network of scientists, researchers, educators, and other interested employees at Leiden University who share an interest in fostering and celebrating sustainability in education.

The Computer Support group provides dedicated support for the computing infrastructure of Leiden Observatory

This thesis studied in depth the energy use and CO2 emissions of the industrial sector in China.

French title: Communication et violences dans le Guéra et le Moyen-Chari (Tchad) de 1940 à 2010. This research investigates the relationship between the introduction of new means of communication and violence experienced by the local populations in the Moyen-Chari and the Guéra regions in Chad from…

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.

The LOFAR e-infrastructure group is responsible for deploying and maintaining LOFAR processing on distributed e-infrastructure. A co-operation between SURFsara, Leiden University and ASTRON, the group develops software to integrate the LOFAR stack with processing pipelines. Our software can schedule…

The Royal Academy of Art and the Royal Conservatoire together with the Academy of Creative and Performing Arts (ACPA) at Leiden University are developing a new platform for research in and with the arts, with an emphasis on collaboration.

Promotor: Prof.dr. S. Portegies Zwart

An Active Galactic Nucleus (AGN) is a highly luminous region at the center of a galaxy, powered by the accretion into a supermassive black hole and emitting energy from radio waves to gamma rays, often outshining the host galaxy.