Leiden University has a rich history in the domain of Papyrology. Papyrology+, founded in 2014, is a collaboration of Leiden scholars studying (Abnormal) Hieratic, Demotic, Aramaic, Greek, Latin, Coptic, and Arabic papyri from a socio-historical, economic and linguistic perspective.

Finally we know for sure that there is a black hole at the centre of our own galaxy. Today, astronomers unveiled the first ever photo of Sagittarius A*, a super-massive object at the centre of the Milky Way. This picture could only be taken thanks to the cooperation of telescopes worldwide.

The extensive use of electronic communication channels and other devices has opened new possibilities for collecting data on human behavior. This information is sometimes openly accessible, but largely part of administrative registration systems that are not open to the broader public. The data provides…

The research group Cyber Security Governance will provide cutting-edge academic research in the domain of cyber, where modern technology interacts with traditional concepts such as governance, sovereignty, law-enforcement, international relations and conflict.

Promotor: S.M. Verduyn Lunel, Co-promotores: M.F.E. de Jeu, B. de Pagter

We examine the effect of social learning on emotional competence in children and adolescents with a typical or atypical development.

In this thesis we classify the pairs (p,G), where p is a prime number and G is a finite p-group possessing an intense automorphism, i.e. an automorphism that sends each subgroup of G to a G-conjugate, that is non-trivial and whose order is coprime to p.

Researchers at Leiden study group behaviour. One of their findings is that when people make sacrifices for another member of their group, it is probably instinctive. Insights of this kind enable us to better understand and influence the social processes in a neighbourhood or company.

The radio sky harbours both galactic and extragalactic sources of arcminute- to degree-scale emission of various physical origins. To discover extragalactic diffuse emission in the Cosmic Web beyond galaxy clusters, one must image low–surface brightness structures amidst a sea of brighter compact fore-…

Collaboration is increasingly common among teachers in schools. As such, teacher education should prepare prospective teachers to effectively interact with other teachers in different types of communities or groups.

The main topic of this PhD thesis is the Arakelov ray class group of a number field, an algebraic object that contains both the ideal class group structure and the unit group structure.

Terrorist groups adapt to environmental changes to maintain power. This project provides new insights by developing a theory of strategic target selection and using big data analytics and machine learning to test these hypotheses.

Health Data Science Leiden University

On 23 April, Rowie Stolk defended the thesis 'Interest group litigation in the Dutch polder: An interdisciplinary perspective on access to the courts'. The doctoral research was supervised by Ymre Schuurmans and Jerfi Uzman.

Promotor: P. T. de Zeeuw, Co-promotor: N. Neumayer; G. van de Ven

This dissertation is a collection of four research articles devoted to the study of Kummer theory for commutative algebraic groups.

The programme group Clinical Neurodevelopment Sciences is located in the Faculty of Social and Behavioural Sciences of Leiden University near Central Station.

The programme group Educational Sciences is located in the Faculty of Social and Behavioural Sciences of Leiden University near Central Station.

The focus of our theoretical physics research is the nature of macroscopic matter that is in one or the other way still in the grip of quantum physics.

Our world is shrinking, or at least our electronic devices are. From PCs to mobile phones: everything is smaller and thinner. The smaller the chip, the better it can conduct electricity and pass on information.

The research group ‘Quantum and Society’ explores the boundary between quantum technology and science communication.

The research group on Diplomacy and Global Affairs studies international diplomacy, international organisation, global, transnational, multi-level and comparative governance.

People are less willing to give up an interest when in a negotiation situation than when they can do it of their own free will, as Leiden University psychologist Eric van Dijk discovered. Knowledge of this kind can be used by policy makers, for instance, to motivate people to adopt certain desirable…

This minor focuses on how our thoughts, emotions and behaviour are influenced by other people, and how we influence other people.

Health inequities, obesity among children, loneliness, performance stress among youngsters. What are the drivers behind such ‘wicked problems’ and how might they be related? This interdisciplinary minor offers you the possibility to work with societal partners to gain a deeper understanding of real-life…

We are interested in understanding the mechanics of soft materials, of which biological materials are prominent examples.

We are cosmologists, in other words we use physics to study the Universe, how it started and evolved into the structure that we observe around us.

In this thesis, we use low-frequency and high-frequency radio observations to address the following questions regarding quasars: is the radio loud/quiet quasar dichotomy real?

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.

The Leiden Political Economy Group (L-PEG) is a multi-disciplinary network of scholars with a research interest in (comparative / global) political economy based at Leiden University. Our members belong to various institutes and faculties across Leiden University, and from other universities across…

Truth is stranger than fiction. In 1997 Juan Maldaceña discovered a remarkable dictionary that translates equation for equation the physics of black holes in string theory into the more conventional physics of quantum mechanics of interacting particles. The remarkable possibility exists that…

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

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

Simulation project EAGLE has won the 2022 Group Achievement Award of the Royal Astronomical Society. EAGLE is a large collection of simulations about the formation of galaxies. The largest simulation contains as many as 6.8 billion particles and took months to calculate on the world's fastest superc…

Enforcement of group cooperation fails because of discriminatory punishment, according to research by Welmer Molenmaker and colleagues. When group members have different backgrounds, punishment turns into a double-edged sword: no longer used just to prevent group exploitation, but also to break the…

It has now been well established that shocks and turbulent motions in the intra-cluster medium (ICM) generated through cluster mergers can produce large-scale synchrotron emission.

The thesis focuses on synthesis strategies in oligosaccharide campaigns, and the influence of protecting groups.

The Educational Sciences programme group of the Institute of Education and Child Studies at Leiden University provides courses in the field of student education and the learning and development of children in the school context.

Course, Intervision

The focus of our theoretical research is understanding the behaviour of soft condensed matter, physical matter which is deformed or structurally altered by thermal fluctuations or small stresses.

The programme group Research Methods and Statistics offers support to researchers from a variety of research projects within Education and Child Studies.

The development of space resource activities is happening now. In the absence of a clear framework to govern these activities, there is a need to examine the concepts that are being discussed in order to ensure that they meet existing treaty obligations regarding on-orbit operations and space resource…

Interest groups play an important role in democratic society.