When a physical system possesses symmetries, these are often accompanied by a representation of the symmetry group on a Hilbert space. Group representations on Hilbert spaces have been extensively studied.

Greek papyrology is the science that is concerned with deciphering and studying all texts written in Greek on papyrus. Papyrus was the writing material of antiquity and was made from strips of the papyrus plant stuck together.

Speeches and speech acts have been crucial in settling the question at the centre of every political debate: who gets what, when and where?

Carsten Stahn has just published Confronting Colonial Objects: Histories, Legalities and Access to Culture. The book is part of the OUP Cultural Heritage Law and Policy Series.

Surreal Geographies recovers a forgotten archive of Holocaust representation. Examining art, literature, and film produced from the immediate postwar period up to the present moment, Kathryn L. Brackney investigates changing portrayals of Jewish victims and survivors.

In A History of Plague in Java, 1911–1942, Maurits Bastiaan Meerwijk demonstrates how the official response to the 1911 outbreak of plague in Malang led to one of the most invasive health interventions in Dutch colonial Indonesia.

Subproject of

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.

Papers written on the occasion of the 30th anniversary of the institute of Prehistory, Volume II.

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. Papyrology+ aims to explore new opportunities and directions in the study of ancient…

The first decade of excavations at Oss

Case Studies in Etruscan Ritual Behaviour

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.

Our research primarily focuses on the early universe and its origins in theories that go beyond the Standard Model of particle 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.

It recently emerged that a Swiss firm secretly owned by the CIA and the West German intelligence service BND had been selling manipulated coding equipment to numerous governments, including allies, to spy on them through a Swiss cover firm for years.

Understanding the evolving landscape of extremism in the 21st century.

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.

This work analyzes ritual practices and knowledge related to the Mesoamerican calendar with the aim of contributing to the understanding of the use and conceptualization of this calendar system in the contemporary K’iche’ community of Momostenango, in the Highlands of Guatemala.

Our research group Intelligence and Security, provides a diverse range of educational opportunities that combine theoretical foundations with practical applications in intelligence and security.

The War, Peace and Justice group unites scholars and practitioners to explore war dynamics, peace promotion, and justice’s role in conflict and global affairs.

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

The Leiden Papyrological Institute is the only papyrological institute in the Netherlands, and one of the few institutes in the world where study of Greek and Demotic Egyptian is combined. This is reflected in both teaching and research. Members of the Institute are active in publishing texts from various…

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 five year research project aimed to investigate the role of minor central places in the economy of Roman Central Italy.

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

This research aims to study the practice of cremation in Alexandria and Graeco-Roman Egypt, through the examination of its cinerary urns.

The Violence and Violence Prevention research group at Leiden University focuses on understanding and preventing violence in modern societies. The group offers two key educational programmes: the Minor Violence Studies and the Governance of Violence specialisation within the Master’s in Crisis and Security…

My work is motivated by the necessity to extend Standard Model of Particle Physics in order to explain three observed phenomena that this great theory fails to accommodate

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