1.7k citations · 13.5k across the 186 of their papers we have counts for
10 papers · 2 filters
The Local Theory of the Cosmic Skeleton
D. Pogosyan, C. Pichon, C. Gay +4
The local theory of the critical lines of 2D and 3D Gaussian fields that underline the cosmic structures is presented. In the context of cosmological matter distribution the subset…
Phase-space structures I: A comparison of 6D density estimators
M. Maciejewski, S. Colombi, C. Alard +2
This paper reviews and analyses methods used to identify neighbours in 6D space and estimate the corresponding phase-space density. It compares SPH methods to 6D Delaunay tessellat…
The fully connected N-dimensional skeleton: probing the evolution of the cosmic web
T. Sousbie, S. Colombi, C. Pichon
A method to compute the full hierarchy of the critical subsets of a density field is presented. It is based on a watershed technique and uses a probability propagation scheme to im…
Cold streams in early massive hot haloes as the main mode of galaxy formation
A. Dekel, Y. Birnboim, G. Engel +7
The massive galaxies in the young universe, ten billion years ago, formed stars at surprising intensities. Although this is commonly attributed to violent mergers, the properties o…
Full-Sky Weak Lensing Simulation with 70 Billion Particles
Romain Teyssier, Sandrine Pires, Simon Prunet +7
We have performed a 70 billion dark-matter particles N-body simulation in a 2 Gpc periodic box, using the concordance, cosmological model as favored by the latest WMAP3 re…
Initial Conditions for Large Cosmological Simulations
S. Prunet, C. Pichon, D. Aubert +3
This technical paper describes a software package that was designed to produce initial conditions for large cosmological simulations in the context of the Horizon collaboration. Th…
Numerical investigation of lenses with substructures using the perturbative method
Sébastien Peirani, Christophe Alard, Christophe Pichon +2
We present a statistical study of the effects induced by substructures on the deflection potential of dark matter halos in the strong lensing regime. This investigation is based on…
On the Onset of Stochasticity in CDM Cosmological Simulations
Jerome Thiebaut, Christophe Pichon, Thierry Sousbie +2
The onset of stochasticity is measured in CDM cosmological simulations using a set of classical observables. It is quantified as the local derivative of the logarithm of the dis…
Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation
P. Ocvirk, C. Pichon, R. Teyssier
(abridged) The physics of diffuse gas accretion and the properties of the cold and hot modes of accretion onto proto-galaxies between z=2 and z=5.4 is investigated using the large…
Recovering the topology of the IGM at z~2
S. Caucci, S. Colombi, C. Pichon +3
We investigate how well the 3D density field of neutral hydrogen in the Intergalactic Medium (IGM) can be reconstructed using the Lyman-alpha absorptions observed along lines of si…