Fredagskollokvium: Exploring extensions of the standard model of cosmology using relativistic simulations

Øyvind Christiansen, PhD student at Institute of Theoretical Astrophysics, University of Oslo.

portrettbildet av en ung smilende mann
Øyvind Christiansen, PhD student in Cosmology and Extragalactic Astronomy, ITA. Photo credits: ITA/UiO.

The standard model of cosmology has been very successful in describing cosmological observations so far, but with the latest generation of surveys some observational tensions have started to grow significant. If not due to some unknown systematic, this must be accounted for by an extension of the cosmological model, and we consider a particular model that might explain some of the observational features by adding dynamics to the poorly understood dark energy component. Since it ultimately must behave like the standard model on the smallest and largest scales, the extension of the model must only become important at some intermediate region around the size of galaxy clusters, which can be done using non-linearities in the dark energy field equations.
The main work to be presented here is the construction of a simulation pipeline to rigorously explore all implications of such a model, extending on previous work in relaxing conditions of quasi-static evolution and consistently keeping first order perturbations in the metric potentials. I present some of the results of our early investigations and point towards interesting further considerations.


illustrasjon som ser som et nett rødt og gult
The symmetron dark energy field at redshift zero with dark red color indicating symmetry breaking, which happens in low density environments.

This Friday colloquium will be hybrid. Attendees can therefore participate either in-person or via Zoom. Please join via Zoom at

Meeting ID: 690 0104 3754

Passcode: PeiseStua3

Attendees will be muted during the colloquium, but will have the opportunity to ask questions at the end by clicking on the "raise hand” button (or send a request via chat).

Emneord: fredagskollokvium, institute seminar, Kosmologi, Cosmology, mørk energi, Modellering og simulering, dark energy
Publisert 25. nov. 2022 10:36 - Sist endret 25. nov. 2022 10:39