The focus of the dissertation

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.

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

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.

The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters.

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

Promotie

This thesis focus on the interaction between M dwarf stellar winds and Galactic cosmic rays and the possible effects on the habitability of exoplanets.

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

In my thesis I study Majorana fermions from three different perspectives. The first one corresponds to non-interacting Majorana fermions that, however, pose non-trivial topological properties. The second one corresponds to strongly interacting Majoranas and the third to relic neutrinos. No one knows…

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).

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

Promotie

Promotie

Promotor: Prof.dr. H.J.A. Rottgering

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

Promotor: Prof.dr. M. de Jong

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”.

Promotie

Promotie

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

Promotie

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

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

Promotie

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.

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.

Promotie

The LOFAR radio telescope produces petabytes of data every year. Radio Astronomers use complex multi-step pipelines to process this data and produce scientific images.

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.

Three major cosmology-focused missions are planned for the next decade: the Euclid space telescope, the Vera C. Rubin Observatory in Chile, and the Nancy Grace Roman Space Telescope.

Galaxies in the local Universe fall into two main categories of spirals and ellipticals. In this Thesis, we explore the structural evolution of galaxies into this bimodal distribution.

Promotor: A. Achúcarro, Co-Promotor: J.W. van Holten

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

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.

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

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.

The Standard Model (SM) of particle physics fails to explain several observed phenomena and is incomplete. In order to resolve this problem, one may extend the SM by adding new particles.

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

Voor het project Train your Brain heeft Janna Marie Bas-Hoogendam de Medical Delta Talent Acceleration Grant ontvangen. 'Mijn pilotproject concentreert zich niet op een specifieke onderzoeksvraag, maar introduceert een nieuwe technologie en creëert een innovatieve labopstelling.'

Wat heb jij nou aan astronomie? De podcast Cosmic Perspectives onderzoekt de impact van Nederlandse astronomie op onze samenleving: van het opbouwen van positieve internationale relaties tot de ontwikkeling van baanbrekende technologie.

De European Research Council heeft een Starting Grant toegekend aan vijf jonge Leidse wetenschappers. Met maximaal 1,5 miljoen kunnen ze hun onderzoeksonderwerp verder uitdiepen.

De Leidse Sterrewacht gaat deelnemen aan de activiteiten van het International Year of Light (IYL). Het jaar 2015 is door de Verenigde Naties uitgeroepen tot het International Year of Light and Light-based Technologies. IYL 2015 zal aan de wereld laten zien hoe belangrijk licht en optische technologie…

Van Mexico en Indonesië tot China en Tsjechië: mensen van over de hele wereld lazen over de publicatie van de Leidse Sterrewacht over de geboorteplaats van kometen. Dit onderzoek suggereert dat alle kometen in ons zonnestelsels mogelijk op dezelfde plek geboren zijn: een bepaalde zone in de platte schijf…

Afgelopen week boog de rechtbank zich over twee verschillende zaken van jonge mannen (20 en 22 jaar) die er beide van verdacht worden lid te zijn van een extremistische terroristische organisatie. Het OM heeft voorwaardelijke celstraffen en een taakstraf geëist tegen de twee mannen. Jelle van Buuren,…