In this thesis, the research focuses on the properties of dark matter and dark matter haloes and how they connect with the galaxies we can observe in the Universe.

Promotor: Huub J.M. de Groot, Co-promotor: Francesco Buda

During my PhD research, I studied the photon statistics of light emitted by a microcavity that contains a single quantum dot (QD) on resonance.

Promotor: Prof.dr. A. P. IJzerman, Co-Promotor: Dr. L.H. Heitman

Promotores: A.P. IJzerman, H.W.T. van Vlijmen

As a virtually inexhaustible source, solar energy plays a major role in future global energy scenarios.

The small quantum world and our world of perception obey different laws of nature. Leiden physicists search for the border between both worlds. In an article published soon in Physical Review Letters they set an upper limit.

Electrons in a crystal lattice have properties that may differ from those of a free electron in vacuum.

The risk that conspiracy theories could incite a broad movement against the established political order is virtually non-existent. This is what researcher Jelle van Buuren of the Institute of Security and Global Affairs concluded in his PhD dissertation.

Source: ChemMedChem (2015)

Leiden biologist Suzanne Lommen and an international team of scientists have investigated how a beetle can reduce hay fever in Europe. Locally, the beetle is even able to stop pollen production in a plant that causes allergic reactions. Publication in Nature Communications on April 21.

This thesis explores different avenues to develop insurmountable antagonists for CC Chemokine Receptors, such as CCR1, CCR2 and CCR5.

Can astronomers mitigate climate change? This is what Leiden astronomer Leonard Burtscher and his colleagues discussed at the annual meeting of the European Astronomical Society. For the second year in a row, the meeting was online. And according to Burtscher, it should stay that way. During a special…

‘It became very clear that Brazilian legislative policy was frail, obsolete and unreliable,’ says Felipe de Paula. He will defend his dissertation on the limits and possibilities of legislative policy in Brazil on Tuesday 27 March 2018.

Galaxy intrinsic alignments induce a major astrophysical contamination to weak gravitational lensing measurements and need to be modelled and mitigated when extracting cosmological information from such measurements.

What is the connection between materials with weak and strong gravitational interactions?

University lecturers who are in the process of obtaining the Basic Teaching Qualification (BKO) and who teach programmes in English will also need the Basic Qualification in English Language Skills certificate, which guarantees a basic standard of English.

From the discovery of exoplanets to the hunt for extraterrestrial life. At the Astronomy Gala on 17 December in the concert hall in Leiden, astronomers looked back, but above all ahead. With King Willem-Alexander as guest of honour.

Developing computational algorithms for structural biology -A high resolution, three dimensional view of a molecule provides detailed information that help elucidate its function: by knowing the exact arrangement of atoms in a molecule, we can understand disease, develop drugs to combat them and improve…

As with other dual-use technologies, non-lethal drone applications are increasingly becoming both a cause for concern and an exciting area of development.

News articles have only a limited influence on the course of legislative processes. This is the finding of political science expert Lotte Melenhorst in her PhD dissertation. Defence 21 March.

Promotor: M. Ubbink, Co-promotor: G. Siegal

Galaxies form and live inside dark matter haloes. As a consequence, they are exposed to the tidal fields generated by the surrounding matter distribution: this imprints a preferential direction to the galaxy shapes, which leads to a coherent alignment on physically close galaxies, called intrinsic a…

Source: Biosens Bioelectron, Volume 74, pp. 233-42 (2015)

Authors: Pierre-Bruno Ruffini and Olga Krasnyak

CT scanning of skeletal remains can tell us about how strong or weak a persons bones were and we can relate that back to diet, activity, and reproductive factors.

Promotor: Ronald Cramer, Co-promotor: Serge Fehr

PhD Defence

In the search for sustainable energy solutions, the idea of artificial photosynthesis has been proposed as an approach with which to use water and sunlight to produce hydrogen.

Making Mars suitable for human habitation or giving first-year lectures as a student. For the past three years, 150 bachelor’s students have followed a challenging Honours track alongside their regular study programme. On 15 November they were awarded a certificate for their achievements.

In a recent study, Dr. Moji Aghajani and colleagues show that adolescents with a severe form of Conduct Disorder (CD) -with limited prosocial emotions- require an unusually large amount of brain capacity to read emotional faces. These effects were found in comparison to CD youth without limited prosocial…

In July 2021 the Leiden Empowerment Fonds (LEF) awarded a research grant of €13,500 for research into the history of maritime law in early modern times.

Interview with political scientist Hans Vollaard (Leiden University) about “Nexit” speculations, the strengths and weaknesses of Geert Wilders’s Party for Freedom, and the general attitude towards Europe in the Netherlands.

Experimentalism has emerged as a prominent approach for addressing environmental problems. Christopher Ansell (Berkeley) and Martin Bartenberger (Leiden University) survey the diversity of experimentation methods, identifying their strengths and weaknesses, and suggesting possibilities for fruitfully…

This thesis is a collection of experimental attempts to enhance photoluminescence of fluorescent molecules and quantum dots with single gold nanorods (GNRs) and relevant applications.

A political-legal study of rights invocation by pollution victims in China and Indonesia

Curious about your personal leadership style? The International Leiden Leadership Programme is an honours programme for master’s students looking to understand leadership, train and develop their leadership skills and acquire an insight into their personal strengths and weaknesses.

Promotor: K. Kuijken, Co-Promotor: H. Hoekstra

Leiden University regularly welcomes members of the Royal Family to attend opening ceremonies, lectures, presentations and unveilings of works of art.

NMR theory can be tough. Luckily, most NMR theory can be visualized to aid you in understanding. The animations below show precession with a 180 degree pulse, J-coupling and T1/T2 relaxation.

How can we help children and adults to acquire better reading comprehension? Paul van den Broek and his colleagues at the Brain and Education Lab are searching for an answer to this question by investigating reading and the related brain activity.

‘Visibility and secrecy are both valuable tactics and should not be antagonized in LGBT movements, ’ says Jingshu Zhu. Zhu defended her dissertation on Wednesday 21 February.

A difficulty of studies on chemical kinetics are the reaction time scales and detection of their intermediates.

A common assumption in chemistry is that the coordination number of a catalyst's surface determines the reactivity of the reaction it catalyses. Strikingly, Leiden chemists have now proven that this is not true for nature’s most simple chemical reaction: the dissociation of hydrogen. The researchers…

The Netherlands must introduce a lower limit for tax on profits to prevent major multinationals not paying tax on a structural basis.

The van Exter group has an extensive history of prior research in classical and quantum optics. As former part of the group of Han Woerdman, we have studied topics as diverse as:

This thesis investigates the syntax of object marking in Sambaa and the Bantu languages in general, with particular focus on Swahili and Haya, as points of comparison.

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