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: 6. November 2013
Members involved: Giovanni Marozzi
Topics: Dark energy, Large-scale structure
Type: Presentation
Date: 5. November 2013
Members involved: Alexandros Kehagias, Jorge Noreña Sanchez, Hideki Perrier, Antonio Riotto
Topics: Dark matter, Large-scale structure
Type: Publication
Date: 29. October 2013
Members involved: Francesco Montanari, Enea Di Dio, Ruth Durrer
Topics: Large-scale structure
Type: Presentation
Date: 9. October 2013
Members involved: Matteo Biagetti
Topics: Large-scale structure, Dark matter
Type: Presentation
Date: 8. October 2013
Members involved: Matteo Biagetti, Kwan Chuen Chan, Vincent Desjacques
Topics: Large-scale structure, Dark matter
Type: Publication
Date: 27. September 2013
Members involved: Matteo Biagetti
Topics: Dark matter, Large-scale structure
Type: Presentation
Date: 11. September 2013
Members involved: Enea Di Dio, Francesco Montanari, Ruth Durrer
Topics: Large-scale structure
Type: Presentation
Date: 29. August 2013
Members involved: Enea Di Dio, Francesco Montanari, Ruth Durrer
Topics: Large-scale structure, Euclid Collaboration
Type: Publication
Date: 11. July 2013
Members involved: Azadeh Moradinezhad Dizgah, Antonio Riotto
Topics: Dark matter, Large-scale structure
Type: Publication
Date: 5. July 2013
Members involved: Enea Di Dio, Francesco Montanari, Ruth Durrer
Topics: Large-scale structure, General relativity, Cosmic microwave background
Type: Publication

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Département de Physique Théorique
Université de Genève
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