We study the structure, dynamics and physics of complex networks emerging from the intricate interconnectedness of the constituents of large systems.

From 1967 to 1982, the United Nations undertook several peacekeeping operations in the Middle East. In his thesis from the Institute for History, Diego Salama examines how these operations were connected and their impact on the region.

This is an Erasmus+ International Credit Mobility project of Leiden University's Faculty of Law with Universidad de Diego Portales in Chile.

Open conversation at Leiden University College about impediments, disability and the university as knowledge infrastructure with Prof. Florencia Herrera, Universidad Diego Portales (Chile), director of the Núcleo Milenio DISCA - Disability & Citizenship.

Lecture

Every year, the Leiden Institute of Physics (LION) organises the Science Day. The goal is to highlight the newest research at LION, to socialise, and to welcome first year master students and new PhD's and Postdocs to our institute.

In this thesis,

In this thesis, we extend the concept of null models as canonical ensembles of multi-graphs with given constraints and present new metrics able to characterize real-world layered systems based on their correlation patterns.

For many system in statistical physics the microcanonical and canonical ensemble are equivalent in the thermodynamic limit, but not for all.

Despite being the object of intense study, embryonic development has been difficult to model due to a number of reasons. First, complex tissues can be comprised of many cell types, of which we probably only know a subset.

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…

Stochastic resetting is simple enough to be approached analytically, yet modifies stochastic processes in a non-trivial way.

Systems with local constraints is a new finding in recent researches on complex systems. The heterogeneous spatial interactions and the temporal dependencies among those numerous units make it difficult to describe by traditional statistical physics.

Lecture

Leiden University has signed a substantial number of Memoranda of Understanding with institutions in Latin America and the Caribbean Region.

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…

Research within the centre is broad and pluralistic, ranging from the history of political thought to contemporary analytic and continental political philosophy and critical social theory. Members of the CPP also participate in the Research Profile Area on Political Legitimacy. The Centre is the proud…

Cooperation with Latin America aims to build on the long-standing relation that Leiden University has with multiple partners in the region.

The recognition that there may be more, so-called allosteric binding sites on a given receptor has also fueled our synthetic efforts. Over the last few years we have focused on many drug targets (adenosine A1, A2A and A3 receptors, the mGlu2 receptor and a classic ‘anti-target’, the hERG channel) to…

The discovery of new medicines is a tedious and lengthy process. On average, over 10,000 molecules need to be studied for one to become a drug and reach the patient. Part of that process are the very costly clinical trials in humans, and candidate drugs often fail due to side effects or lack of efficacy.…

Learn about the Institute’s mission, structure and academic community within Leiden University’s Faculty of Humanities.

Onze samenwerkingsovereenkomsten bieden zowel studenten als medewerkers de kans om een periode in het buitenland te verblijven en zo hun horizon te verbreden. Ook fungeren de overeenkomsten regelmatig als basis voor onderzoeksprojecten of andere samenwerkingsvormen.

In 2025 hebben medewerkers en studenten van de Universiteit Leiden veel mooie prijzen ontvangen en belangrijke onderzoekssubsidies binnengehaald.

On this page you will find an overview of awards and prizes granted to our staff and students in 2025, as well as special appointments at Leiden University and other institutions.

The project has been done under the supervision of Dr. Diego Garlaschelli and Dr. Frank Takes. The title of the presentation is: ''Complex Network Analysis of Darknet Black Market Forum Structure.

A full overview of all loans and debts between banks would help preventing a new financial collapse. But banks do not provide this information. An econophysics model by Diego Garlaschelli and collaborators reconstructs the most probable situation and finishes first place in two independent tests.

In 2025, the Europa Institute successfully helped apply for an ICM+ grant allowing student and staff exchange between Leiden and the Diego Portales University, one of the leading universities in Chile.

Psychology Lab on Wheels makes science accessible for everyone. On Monday 24 June, we will be back with our mobile lab at the Old Observatory near the Singelpark in Leiden. Join our research to learn to better recognise emotions with a Serious game and read more about participant Maxime and game developer…

Jasper de Bie, who obtained his doctoral degree at the Institute of Criminal Law & Criminology and who is currently employed by the Ministry of Security and Justice, has been awarded an honourable third place in the international competition 'TRI Award for the Best Doctoral Dissertation on Terrorism…

Two research projects with researchers from Leiden University have been awarded a Dutch Research Council (NWO) Open Competition Domain Science-M programme grant. These grants fund curiosity-driven, fundamental research in the Science domain.

The seminar is dedicated to the research and work in progress of Leiden Centre for Continental Philosophy staff and doctoral students. It also welcomes guest speakers.

Een mijlpaal voor de Class of 2025 van de MSc International Relations and Diplomacy: een prestigieuze en internationale opleiding gevierd in Den Haag en Leiden.

Scientists often need to make sense of complex systems without knowing the important parameters or even without access to all the information. A collaboration of network theorists, including Diego Garlaschelli (IMT Lucca/Leiden), has now published a review article in the inaugural issue of Nature Reviews…

This project focuses on a striking parallelism between two macro-groups of languages: southern Italian dialects and the so-called split-ergative languages, like Basque, Georgian, Dyirbal, Hindi/Urdu.

LCN2 hosts seminars on the last Friday of each month.

‘It has never been so easy to set up a Studium Generale series.’ With these words Tilman Grünewald thanked speaker Frank den Hollander, who kicked off the Studium Generale series on complex networks on Monday 20 February.