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Why do black holes emit thermal radiation? And how does a closed quantum system thermalize?

The linguistic project constitutes the connection between the two other subprojects. It consists of two parts.

'Politics of Withdrawal' considers the significance of practices and theories of withdrawal for radical thinking today.

Political protest is often at least partially about the question of legitimacy. How can we distinguish whether a regime is legitimate, or merely purports to be so?

View tuition fee information for the MSc Political Theory: Legitimacy and Justice at Leiden University, including how fees vary by nationality, residency status and programme category.

The first of the two volumes of this co-authored study has just been published by Metzler. The study explores the history of the concept ‘barbarism’ from the 18th century to the present and illuminates its foundational role in modern European and Western identity.

Bernini and Pallavicino, the artist and the Jesuit cardinal, are closely related figures at the papal courts of Urban VIII and Alexander VII, at which Bernini was the principal artist. The analysis of Pallavicino's writings offers a new perspective on Bernini's art and artistry and allow us to understand…

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Learn how to apply for the Master's programme Political Theory: Legitimacy and Justice at Leiden University with step-by-step application instructions, document submission via Studielink, and next steps after applying.

Does suffering suffice? Andrei Poama, Assistant Professor at Leiden University, and Paul C. Bauer, research fellow at the Mannheim Centre for European Social Research, did an experimental assessment of desert retributivism. Their resulsts were published on April 20 on PLOS ONE.

On Thursday 29 January 2026 Uğur Derin successfully defended a doctoral thesis and graduated.

Together with two other authors, Jaroslaw Kantorowicz from ISGA investigates the susceptibility to believing in misinformation.

Classical statistical methods, such as p-values, are difficult for researchers to apply correctly. They for example do not allow drawing conclusions from a study early, or for extending a study with extra research groups that want to make their data available later.

On 23 October 2019, Yoram Stein defended his thesis 'Spinoza's Theory of Religion: The Importance of Religion in Spinoza's Thought and Its Implications for State and Society'. The doctoral research was supervised by Prof. P.B. Cliteur and Prof. A.A.M. Kinneging.

On 7 September, Francesc Claret Traid defended the thesis 'On the nature of the right to resist: a rights-based theory of the ius resistendi in liberal democracies'. The doctoral research was supervised by Afshin Ellian and Gelijn Molier.

The ‘Committee for Assessing Ethical Aspects of Partnerships’ is being launched this month. This committee, created by Rector Magnificus Hester Bijl and consisting of former and present Leiden University researchers, has been tasked with assessing Leiden University’s institutional ties with organisations…

This thesis investigates durational aspects of the Italian mobile diphthongs with respect to other rising diphthongs and monophthongs and it shows to what extent the monophthong/diphthong alternation still occurs in contemporary Italian.

In a newly published book chapter, Transparency and information: Factors needed to promote ethical investments, ELS lab member Sarah Vandenbroucke discusses why information and transparency are needed to promote ethical investments.

In this thesis we construct an extension associated with the Furstenberg compactification of symmetric space of noncompact type. From this extension we get a cycle in equivariant KK-theory representing the extension. The construction of the extension and the corresponding cycle is a generalization of…

The book offers different theoretical perspectives to help examine the process of public sector reform. In addition it gives an overview of the major trends in the core areas of the functioning of the public sector.

This thesis is is made of three parts. The first part describes a generalization of the Chabauty's method, that can be used to determine the rational points of a curve such that s+g>r+1, where g is the genusof the curve, r is the rank of the Mordell-Weil group of the jacobian of the curve and s is…

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This dissertation focuses on questions about the purposes of education and what it means to be educated. These questions are relevant across time, as the answers to these questions are always to some extent related to contemporary society.

This collection brings into conversation several kinds of scholarship on medieval authorship which have tended to remain separate over the last two to three decades, a period of steadily increasing scholarly interest in this topic.

This Thesis shows discoveries in non-linear astrochemical kinetics as well as a deeper analysis of dark clouds chemistry.

Playing the piano with your forearm, plucking the strings, sawing through the piano: pianist Luk Vaes's doctoral dissertation covers all the techniques of play for which a piano is NOT designed. His defence ceremony will consist of three concerts and a public defence. 'Musicians were using the interior…

Cognitive enhancement reflects the use of any (legitimate) means such as for example food supplements to reach one’s personal best.

String theory has come under fire in recent years. Promises have been made that have not been lived up to. Leiden theoretical physicists have now for the first time used string theory to describe a physical phenomenon. Their discovery has been reported this week in 'Science'.