Résumé / Abstract Journal-club_Postdoc

Journal-club Postdoc

« A unique composition of emptiness - Cosmic voids as cosmological probes »

Nico Hamaus

Redshift surveys measure the location of millions of galaxies in the observable Universe, thereby constructing a three-dimensional map of its large-scale structure. This structure is characterized by dense clusters of galaxies that are connected by filaments and sheets of lower galaxy number density. However, the remaining and dominant volume within this cosmic web is taken up by voids, vast regions of relatively empty space.
In this talk I will present some recent advances in modeling average void density and velocity profiles, as well as their anisotropic clustering statistics in redshift space on the basis of state-of-the-art N-body simulations and mock galaxy catalogs. While clusters, filaments and sheets have entered various stages of nonlinearity in the past, the dynamics of voids can be described remarkably well by linear theory, suggesting them to be among the most pristine objects to consider for future studies on the nature of dark energy, dark matter and gravity.
mardi 28 avril 2015 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
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