688 search results for “cosmological perturbation theory” in the Public website

Hunting for new physics in the primordial Universe
This thesis contributes to studying primordial cosmology theories and their detectability in future observations.

Inflation, Adiabaticity and the Speed of Sound of the Curvature Perturbations
Promotor: A. Achúcarro, CoPromotor: G.A. Palma

Effects of heavy fields on inflationary cosmology
Promotor: Prof.dr. A. Achucarro, CoPromotor: J.W. van Holten

Pulses in singularly perturbed reactiondiffusion systems
Promotor: Arjen Doelman, Copromotor: Vivi Rottschäfer
 Cosmology

Enlightening the Primordial Dark Ages
This thesis is dedicated to the exploration of the primordial dark ages: unknown physics during the earliest stages of the Universe’s expansion that have not yet been directly probed by observations. Cosmic inflation is a burst of exponential expansion of space after the “Big Bang”.

Weighing the Dark: Cosmological Applications of Gravitational Lensing
Promotor: K. Kuijken, CoPromotor: H. Hoekstra

Astronomy and Cosmology (MSc)
The master's specialisation Astronomy and Cosmology at Leiden University covers all aspects of modern astrophysics, including observation, interpretation, simulation and theory. This programme is essentially based on combined research in astronomy and physics and is therefore open for students with…

Aspects of cosmic acceleration
The focus of the dissertation

Research in Physics, Cosmology (MSc)
The master’s specialisation Cosmology at Leiden University is positioned at the interface between Theoretical Physics and Observational Astronomy. The main elements are theory, data analysis and numerical simulations, with research on the origin of dark matter as one of the highlights.

Here it is. A Nahuatl translation of European cosmology
Context and contents of the Izcatqui manuscript in the Royal Tropical Institute, Amsterdam

Subodh Patil Group (Particle Cosmology)
Our research primarily focuses on the early universe and its origins in theories that go beyond the Standard Model of particle physics.
 Matthieu Schaller Group (Numerical Cosmology)

Cosmological interpretation of architecture: cases from Ancient China and Mesoamerica
The civilizations of ancient China and Mesoamerica, although not historically related and obviously different in many specific aspects (such as language and writing), show many interesting commonalities and similar tendencies in their cultural manifestations.

Probability theory
The research programme Probability Theory focuses on probability theory and on operations research.

Theory
Many important topics in computer science, such as the correctness of software, the efficiency of algorithms and the modeling of complicated systems, depend on sound theoretical underpinnings. In the Theory group, we study these fundamental building blocks and develop verification methods to prove system…

Theory
Many important topics in computer science, such as the correctness of software, the efficiency of algorithms and the modeling of complicated systems, depend on sound theoretical underpinnings. In the Theory group, we study these fundamental building blocks and develop verification methods to prove system…

Algebra, Geometry and Number Theory
The research of the Algebra, Geometry and Number Theory programme ranges from fundamental mathematical theory to algorithms and applications.

Concrete arithmetic between geometry and number theory
Bruin

Patterns in natural systems
Promotor: A. Doelman, Copromotores: P.J.A. van Heijster; A. Zagaris

Key Issues in Historical Theory
This book addresses the definition of history and how people are influenced by it.
 Diplomatic Theory

for transient reductions in the speed of sound of the inflaton in cosmological data, and other topics
Promotor: Prof.dr. A. Achucarro

Mersenne primes and class field theory
Promotor: H.W. Lenstra, Jr., Copromotor: B. de Smit

Primitivism and architectural theory
Subproject of

Modular curves, Arakelov theory, algorithmic applications
Promotor: S.J. Edixhoven, Copromotor: R.S. de Jong

Unveiling dark structures with accurate weak lensing
Improvements of weak gravitational lensing shape measurements are presented and some used for data analysis.
 Econophysics & Network Theory

Algebra, Geometry and Number Theory
The research of the Algebra, Geometry and Number Theory cluster tries to bridge the gap between abstract theory and the world of algorithms and applications.

The Death of Archaeological Theory
The Death of Archaeological Theory, edited by John Bintliff and Mark Pearce, addresses the provocative subject of whether it is time to discount the burden of somewhat dogmatic theory and ideology that has built up over the last 25 years.

Faster number theory, safer cryptography
Developing a method to simplify polynomials in complex curves

Theorie van fermionpariteitomkeringen in supergeleiders
Majorana meets a mermaid

Probing Gravity at Cosmic Scales
The theoretical explanation of cosmic acceleration is nowadays one of the biggest puzzles in cosmology.

On the randommatrix theory of Majorana fermions in topological superconductors
The thesis mainly contributes to the characterization of Majorana fermions as they appear in the Condensed Matter context.

Algebra, Geometry and Number Theory (MSc)
The master’s specialisation Algebra, Geometry and Number Theory at Leiden University is aimed at students who wish to acquire a profound knowledge of one of the areas within pure mathematics. There is a strong theme dealing with algebra and number theory as well as a strong theme dealing with topology…

Sentencing: theory and practice
Sentencing is becoming increasingly complex for the courts. Legal scholars and criminologists from Leiden document the process of sentencing in the Netherlands. They use this knowledge to advise legislators and those who implement this legislation on how to make sentencing more consistent and effect…

The Oxford Handbook of Morphological Theory
Edited by linguists Jenny Audring (Leiden University) and Francesca Masini (University of Bologna), this is a unique handbook with a focus on morphology theories rather than morphological data. It covers a wide array of morphological theories, from traditional twentieth century models to current theoretical…

Jan Zaanen Group (Quantum Matter Theory)
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.

Koenraad Schalm Group (String Theory and Experiment)
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…

Geometry of Vegetation Pattern
One of the effects of climate change is the phenomenon of desertification, a process that occurs in semiarid and arid areas and causes land degradation as well as vegetation loss. Due to the lack of resources, vegetation selforganizes to sustain itself by forming largescale spatial patterns.

Cultural Analysis: Literature and Theory (MA)
The master in Cultural Analysis: Literature and Theory at Leiden University focuses on the study of literature from a comparative and theoretical perspective, with a special emphasis on literary movements and genres of the 19th, 20th, and 21st centuries. It covers a wide range of languages and cultures…

Political Theory: Legitimacy and Justice (MSc)
This political theory specialisation focuses on the concepts of legitimacy and justice—political philosophy’s core themes. Immersing yourself in theories, philosophical and theoretical methods, and complex cases, you will make the leap from opinion to analysis.

Meet this year's Lorentz Professor Renata Kallosh: 'Lorentz is my hero in physics'
Professor Renata Kallosh (Stanford University), one of the world’s leading theoretical physicists, will be this summer’s Lorentz Professor at the Leiden institute for theoretical physics. Her main areas of interest are cosmology and string theory. She studied physics in Moscow, where she also obtained…

Deciphering fermionic matter: from holography to field theory
Promotor: K.E. Schalm, Copromotor: S.S. Lee

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

Transport coefficients and low energy excitations of a strongly interacting holographic fluid
In this thesis, classes of strongly interacting quantum field theories, have been studied.

University Lecturer in Historical Theory / General History
Humanities, Institute for History

Henk Hoekstra appointed Professor Observational Cosmology
Astronomer Henk Hoekstra has been appointed Professor Observational Cosmology at the Leiden Observatory with effect from 1 August.

Open Space project: where dance meets cosmology
Until 15 May, Open Space will give room for artistic creation and experimentation in a partnership between artists and astronomers. The project is a collaboration among Nederlands Dans Theater (NDT), Korzo and the Leiden Observatory. Starting on 3 May, young dancers of NDT 2, three choreographers, three…

International Humanitarian Law in Theory and Practice
The Summer School on International Humanitarian Law is designed by the Grotius Centre KalshovenGieskes Forum on International Humanitarian Law. Information about the next edition will be published in January 2023.