Promotor: Prof.dr. M. de Jong, Co-Promotor: Dr. A.J. Heijboer

The focus of the dissertation

The theoretical explanation of cosmic acceleration is nowadays one of the biggest puzzles in cosmology.

An international team of astronomers from Leiden Observatory and others, has for the first time mapped a piece of the dark, cosmic web. The research strengthens the hypothesis that the young universe consisted of huge numbers of small groups of newly formed stars. The astronomers publish their findings…

In this work the reconstruction of a tau neutrino signal in the KM3NeT detector is discussed.

Promotor: Prof.dr. M. Franx, Co-Promotor: Rychard Bouwens

Promotores: Prof.dr. M. Franx & Prof.dr. P.G. van Dokkum (Yale University)

Of all the mass in our Universe, 80% is thought to consist of a hypothetical and invisible substance called dark matter (DM).

In this thesis, I study the formation of large-scale structure and the physics of particle acceleration at large scales (~Mpc).

In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.

Promotor: Prof.dr. K.H. Kuijken, Co-Promotor: Dr. H.Hoekstra

The largest galaxies in the Universe feed off cosmic oceans, which helps them grow. This is the presumption of an international team of scientist with two Leiden astronomers, based on observations of the ‘Spiderweb’ galaxy. The researchers published their evidence in Science on 2 December 2016.

A team of laboratory astrophysicists from Leiden University managed to make glycerol under conditions comparable to those in dark interstellar clouds. They allowed carbon monoxide ice to react with hydrogen atoms at minus 250 degrees Celsius. The researchers publish their findings in the Astrophysical…

This thesis revolves around the electronic spectroscopy of molecules in the laboratory and the search for the carriers of the diffuse interstellar bands (DIBs).

Galaxies are often found in clusters, which contain many “red and dead” members that stopped forming stars in the distant past. Now, an international team of astronomers, led by Andra Stroe of Leiden Observatory and David Sobral of Leiden and the University of Lisbon, has discovered that these comatose…

In this thesis we study the landscape of gravitational models which modify GR by introducing an additional scalar degree of freedom (d.o.f.) to source Cosmic Acceleration.

Promotor: M. de Jong, Co-Promotor: Samtleben

Lecture

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”.

For the first time, scientists have traced back a high-energy neutrino to its source in space. It was produced by a so-called blazar—a supermassive black hole. Researchers from neutrino detector IceCube report this in Science. ‘This is a milestone for neutrino science,’ says physicist Dorothea Samtleben…

PhD Defence

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

PhD Defence

This thesis contributes to studying primordial cosmology theories and their detectability in future observations.

PhD Defence

The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.

Physicists, including Dorothea Samtleben from Leiden University, are building a giant underwater telescope to unravel the origin of neutrinos and to solve the mystery surrounding dark matter. The first detector has now been installed. Once it is finished, the telescope will be three cubic kilometres…

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

One of the key quests in astronomy is to study the growth and evolution of galaxies across cosmic time. Radio observations provide a powerful means of studying the formation of stars and subsequent buildup of distant galaxies, in a way that is unbiased by the presence of dust.

This project embarks on empirical analysis of popular psycho-physical practices in contemporary Korea.

Lecture

In Universal Śaivism Peter Bisschop provides a critical edition and annotated translation of the sixth chapter of the Śivadharmaśāstra `Treatise on the Religion of Śiva’, the so-called Śāntyadhyāya 'Chapter on Appeasement’. The Sanskrit text is preceded by an extensive introduction on its composition,…

PhD Defence

PhD Defence

PhD Defence

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

Promotor: Jelle S. Kaastra Co-promotor: Jelle de Plaa

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

Promotor: Prof.dr. A. Achucarro, Co-Promotor: J.W. van Holten

We explore the particle physics and quantum world at the time of the big bang.

Promotor: Prof.dr. H.L.V. Linnartz

If Dutch cinema is examined in academic studies, the focus is usually on pre-war films or on documentaries, but the post-war fiction film has been sporadically addressed.

Promotor: Prof.dr. A. Achucarro

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.

We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.

Dishoeck

Promotor: Prof.dr. H. J. A. Röttgering, Co-Promotor: Dr. M. Haverkorn