Publications (26)
Phase-space structure analysis of self-gravitating collisionless spherical systems
Anaelle Halle, Stephane Colombi, Sebastien Peirani
In the mean field limit, isolated gravitational systems often evolve towards a steady state through a violent relaxation phase. One question is to understand the nature of this rel…
Caustics in Dark Matter Haloes
Roya Mohayaee, Stephane Colombi, Bernard Fort +3
Caustics are formally singular structures, with infinite density, that form in collisionless media. The non-negligible velocity dispersion of dark matter particles renders their de…
Skeleton as a probe of the cosmic web: the 2D case
Dimitri Novikov, Stephane Colombi, Olivier Doré
We discuss the skeleton as a probe of the filamentary structures of a 2D random field. It can be defined for a smooth field as the ensemble of pairs of field lines departing from s…
Reconstruction of primordial density fields
Roya Mohayaee, Hugues Mathis, Stephane Colombi +1
The Monge-Ampere-Kantorovich (MAK) reconstruction is tested against cosmological N-body simulations. Using only the present mass distribution sampled with particles, and the assump…
UV Background Fluctuations and Three-Point Correlations in the Large Scale Clustering of the Lyman-alpha Forest
Suk Sien Tie, David H. Weinberg, Paul Martini +4
Using the Ly mass assignment scheme (LyMAS), we make theoretical predictions for the 3-dimensional 3-point correlation function (3PCF) of the Ly forest at redshift .…
Non-Linear Evolution of the Bispectrum of Cosmological Perturbations
Roman Scoccimarro, Stephane Colombi, J. N. Fry +3
The bispectrum, the three-point function of density fluctuations in Fourier space, is the lowest order statistic that carries information about the spatial coherence of large-scale…