Lorentz Institute Theoretical Cosmology

We are active in a large variety of research fields, addressing the most pressing open questions of modern cosmology, ranging from the early to the late universe

Dark Energy and Modified Gravity

We address the phenomenon of cosmic acceleration, exploring alternatives to the cosmological standard model, LCDM, in terms of a dynamical dark energy component or modifications of the theory of gravity on cosmological scales. In particular, we are very active in the application of EFT methods to dark energy, both at the theoretical and the numerical level.

Dark Matter

The group is involved in the SHiP (Search for Hidden Particles) experiment at CERN, which can shed light on minimal extension of the standard model including right-chiral neutrinos, one of them being a dark-matter candidate.


Our group investigates features of the CMB anisotropies that may reveal new, very heavy fields in the very early universe, both with theoretical predictions and searching for these effects in data.


This research line focuses on the exploration of the Universe, and in particular its extreme environments, via neutrinos. It works with the Antares neutrino telescope located on the bottom of the Mediterranean Sea at 2.5km depth. Construction has by now started for a significantly larger structure - named KM3NeT

String Theory

The group studies string theory and its connections to models of particle physics and cosmology in particular. A current focus of their research is the remarkable possibilities that near-future cosmological observations as well as upcoming particle-collider or condensed matter experiments can contain signatures of string theory

Cosmology in the Netherlands

There are many other groups and initiatives involving Cosmology around us. Some are