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.

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.

Besides the Hortus being a beautiful place where visitors can relax and learn more about plants, we also facilitate botanical research. At the botanic garden, our ‘Living Botany’ research group investigates (plant) biodiversity and the relationship between plants and people.

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…

On 21 and 22 November, a conference on Green Regionalism was co-organized by CompaRe and the Centre for Commercial Law in Asia of the Singapore Management University (SMU) Yong Pung How School of Law.

The research group on governance of crises studies phenomena, dynamics and actors related to crisis governance. The Leiden University Crisis Research Center (CRC) is part of this Research Group.

Every PhD candidate has access to MS Teams ‘LACDR PhD group’. This site is specially for PhD candidates of LACDR. We strive to collect here all relevant PhD information and to stimulate the collaboration and communication in the LACDR PhD community.

Together with researchers from over the world, the ENIGMA-Anxiety Working Group endeavors to unravel the neurobiology of anxiety disorders and related constructs.

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

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.

In this 3-volume set of primary sources, Lionel Laborie and Ariel Hessayon bring together a wide range of vital sources for the study of prophecy in the early modern world. This meticulously edited collection includes rare material and fascinating manuscripts published in English for the first time.

In my research, we developed a method to distinguish knots. A knot is a mathematical depiction of the everyday knot that occurs in ropes and cords.

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

The shift from response to recovery is now noticeable as the world moves past the paralyzing effects of the COVID-19 pandemic. This book explores responses to the pandemic by international, regional, and local institutions, multilateral action, and crisis prevention efforts at different levels of governance,…

Promotor: Prof.dr. J. Schaye, Co-promotor: Marcello Cacciato

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…

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

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.

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.

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.

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.

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-…

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 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 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.

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

Health Data Science Leiden University

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.

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.

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.

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?

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.

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…

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

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…

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The research at The Metabolomics & Analytics Centre is centered around developing innovating analytical methods to enable metabolomics-driven systems biology in personalized health strategies.

This study has been carried out in the community of Sukamiskin, a kelurahan (‘village’) in Bandung, the Capital of West Java Province, located in the Sunda Region of Indonesia.