Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Large-scale structure

Observations of the Universe show that, on megaparsec scales galaxies are not distributed homogeneously but rather arranged in a filamentary network, the most luminous of them residing at the nodes of this "cosmic web". In current cosmological models, the large-scale structure of the Universe is the result of tiny fluctuations generated during an inflationary phase and subsequently amplified by gravity. As these fluctuations grew nonlinearly, the baryons fell into the potential wells created by some unknown "cold" (non-relativistic) dark matter component to form stars and galaxies. Because the physics describing the nonlinear stage of galaxy formation is highly complex, numerical simulations have become an absolute must to study the large-scale distribution of galaxies. These simulations can follow the nonlinear collapse of baryons and dark matter over a large dynamical range.   

The large-scale structure of the Universe can strongly constrain viable cosmological scenarios. Weak lensing (distortions in the image of background galaxies induced by the matter distributed along the line-of-sight), galaxy clustering (number of galaxy pairs, triplets etc. in excess of random) and cluster counts (abundance of massive cluster of galaxies) are among the most powerful probes of the large-scale structure. When combined, they can shed light on the mystery of dark energy, the nature of dark matter and the origin of the Universe and its initial conditions.

Recent publications and presentations on this topic
Date: 31. March 2014
Members involved: Julian Adamek, Enea Di Dio, Ruth Durrer, Martin Kunz
Topics: General relativity, Large-scale structure
Type: Publication
Date: 28. March 2014
Members involved: Hideki Perrier
Topics: Large-scale structure, Consistency relations, Modified gravity, Non-local bias, Halo Model
Type: Presentation
Date: 7. February 2014
Members involved: Hideki Perrier
Topics: Large-scale structure, Modified gravity, Bias, Non-local bias, Consistency relations
Type: Presentation
Date: 5. February 2014
Members involved: Alexandros Kehagias, Antonio Riotto
Topics: Large-scale structure
Type: Publication
Date: 31. January 2014
Members involved: Ruth Durrer, Giovanni Marozzi
Topics: Large-scale structure, General relativity
Type: Publication
Date: 25. November 2013
Members involved: Julian Adamek
Topics: General relativity, Large-scale structure
Type: Presentation
Date: 22. November 2013
Members involved: Julian Adamek, David Daverio, Ruth Durrer, Martin Kunz
Topics: General relativity, Large-scale structure, Dark energy
Type: Publication
Date: 20. November 2013
Members involved: Enea Di Dio, Francesco Montanari, Ruth Durrer
Topics: Large-scale structure
Type: Presentation
Date: 13. November 2013
Members involved: Julian Adamek
Topics: General relativity, Large-scale structure
Type: Presentation
Date: 7. November 2013
Members involved: Giovanni Marozzi
Topics: Dark energy, Large-scale structure
Type: Presentation

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Département de Physique Théorique
Université de Genève
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