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: 4. June 2015
Members involved: Ruth Durrer, Francesco Montanari
Topics: Large-scale structure, Euclid Collaboration
Type: Publication
Date: 25. May 2015
Members involved: Francesco Montanari, Ruth Durrer
Topics: Large-scale structure, Euclid Collaboration
Type: Publication
Date: 7. May 2015
Members involved: Subodh Patil
Topics: Cosmic microwave background, Large-scale structure, Effective theories, Data Analysis
Type: Publication
Date: 14. April 2015
Members involved: Giovanni Marozzi
Topics: Large-scale structure, General relativity
Type: Presentation
Date: 9. April 2015
Members involved: Giovanni Marozzi
Topics: Large-scale structure, General relativity
Type: Presentation
Date: 25. March 2015
Members involved: Ignacy Sawicki
Topics: Dark energy, Modified gravity, Large-scale structure
Type: Publication
Date: 20. March 2015
Members involved: Alexandros Kehagias, Azadeh Moradinezhad Dizgah, Jorge Noreña Sanchez, Hideki Perrier, Antonio Riotto
Topics: Large-scale structure
Type: Publication
Date: 6. February 2015
Members involved: Giovanni Marozzi
Topics: Large-scale structure, General relativity
Type: Presentation
Date: 21. January 2015
Members involved: Giovanni Marozzi
Topics: Large-scale structure
Type: Publication
Date: 16. January 2015
Members involved: Julian Adamek
Topics: N-body simulations, General relativity, Large-scale structure
Type: Presentation

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