Exposés à venir
Les organisateurs des séminaires et journées des doctorants sont : Mabrouk Ben Jaba, Rodolphe Abou Assali, Amine Iggidr et Aurélien Minguella
Organisateur à Metz : Simon Bartolacci
A Little History of Cosmic Voids: Mapping Nothing
Catégorie d’évènement : Séminaire des doctorants Date/heure : 24 juin 2026 16:45-17:45 Lieu : Oratrice ou orateur : Freja Amalie Nørby – IECL Résumé :The Universe exhibits a web-like pattern known as the large-scale structure (LSS), where galaxies are assembled into clusters, filaments, and walls surrounding vast underdense regions called cosmic voids. This structure is not directly apparent in the night sky, nor in early astronomical observations, but emerged progressively as galaxy surveys increased in depth and size.
I will give a brief review of the historical development of our exploration of the LSS, starting from Hubble’s identification of galaxies beyond the Milky Way and the discovery of cosmic expansion through redshift measurements, and continuing to modern redshift surveys that map the three-dimensional distribution of millions of galaxies.
These advances revealed the cosmic web and voids as a dominant feature of the observed Universe. This leads to the cosmological survey data I will use for my PhD project and should illustrate the dramatic increase in scale and depth achieved by the next generation of surveys. Such advances require increasingly robust modelling and statistical tools to map and characterize the cosmic web and its voids. This provides the context for my work and, I hope, perhaps answers a question some of you may have been wondering over the past year: what exactly is a cosmologist doing at the IECL?
Archives
Les organisateurs des séminaires et journées des doctorants sont : Mabrouk Ben Jaba et Rodolphe Abou Assali
A Little History of Cosmic Voids: Mapping Nothing
Catégorie d’évènement : Séminaire des doctorants Date/heure : 24 juin 2026 16:45-17:45 Lieu : Oratrice ou orateur : Freja Amalie Nørby – IECL Résumé :The Universe exhibits a web-like pattern known as the large-scale structure (LSS), where galaxies are assembled into clusters, filaments, and walls surrounding vast underdense regions called cosmic voids. This structure is not directly apparent in the night sky, nor in early astronomical observations, but emerged progressively as galaxy surveys increased in depth and size.
I will give a brief review of the historical development of our exploration of the LSS, starting from Hubble’s identification of galaxies beyond the Milky Way and the discovery of cosmic expansion through redshift measurements, and continuing to modern redshift surveys that map the three-dimensional distribution of millions of galaxies.
These advances revealed the cosmic web and voids as a dominant feature of the observed Universe. This leads to the cosmological survey data I will use for my PhD project and should illustrate the dramatic increase in scale and depth achieved by the next generation of surveys. Such advances require increasingly robust modelling and statistical tools to map and characterize the cosmic web and its voids. This provides the context for my work and, I hope, perhaps answers a question some of you may have been wondering over the past year: what exactly is a cosmologist doing at the IECL?