Group Events

Public Holiday

DES meeting

WWF

Post-poned

"Machine learning the formation of dark matter halos"

Special Seminar

"Large-scale structures in the ΛCDM Universe: network analysis and machine learning" https://arxiv.org/abs/1910.07868 

Rodrigo Voivodic

"The Halo-Void Model of Large Scale Structure"

The Halo Model (HM) of Large Scale Structure has enriched our comprehension of how matter is distributed in the Universe. Through the assumption that all matter particles are inside dark matter halos, a natural consequence is that statistical properties of dark matter split into two contributions: one that comes from correlations inside each halo and another coming from correlations across matter particles of different halos. In this work, we extend this assumption by allowing the matter to rest not only inside halos but also inside voids (HVM). We show that including voids into the calculations significantly improves the HM prediction for the dark matter power spectrum, which demonstrates that halos and voids are complementary structures of the Universe. The HVM solves typical practical problems of the HM, such as the need for integrating the mass function down to very small halo masses. Within the HVM we can also provide predictions for cross-correlation functions (e.g. halo-matter and void-matter), as well as the density profiles, with a natural computation of convergent large scale contributions.

Special Seminar

Sunny Vagnozzi

"Recent developments in neutrino cosmology"

Special Seminar

CANCELED

Postponed 

Giorgia

Tamas

"Void size function" https://arxiv.org/pdf/1902.04585.pdf 

"Halo Mass function" https://arxiv.org/pdf/1903.01709.pdf 

International Woman's Day, suggested reading 

https://arxiv.org/abs/1811.11836 

"An alternative approach to the Finger of God in large scale structures" 

https://arxiv.org/abs/1810.01803 

"Counts-in-cells statistics for large-scale structure"

Special Seminal

"Fisher matrix for multiple tracers: model independent constraints on the redshift distortion parameter" https://arxiv.org/abs/1904.00673

 Briefly going through https://arxiv.org/abs/1905.08329

"Weak lensing by voids as a test for alternative cosmological models”

Special Seminal

"A non-fiducial cosmological test from geometrical and dynamical distortions around voids"