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167 papers
The gravitational force field of proto-pancakes
Shohei Saga, Stéphane Colombi, Atsushi Taruya
It is well known that the first structures that form from small fluctuations in a self-gravitating, collisionless and initially smooth cold dark matter (CDM) fluid are pancakes. We…
Fast and accurate collapse-time predictions for collisionless matter
Cornelius Rampf, Shohei Saga, Atsushi Taruya +1
We consider the gravitational collapse of collisionless matter seeded by three crossed sine waves with various amplitudes, also in the presence of a linear external tidal field. We…
LyMAS reloaded: improving the predictions of the large-scale Lyman-α forest statistics from dark matter density and velocity fields
S. Peirani, S. Prunet, S. Colombi +6
We present LyMAS2, an improved version of the "Lyman-α Mass Association Scheme" aiming at predicting the large-scale 3d clustering statistics of the Lyman-α forest (Ly-α) from mode…
Cold dark matter protohalo structure around collapse: Lagrangian cosmological perturbation theory versus Vlasov simulations
Shohei Saga, Atsushi Taruya, Stéphane Colombi
We explore the structure around shell-crossing time of cold dark matter protohaloes seeded by two or three crossed sine waves of various relative initial amplitudes, by comparing L…
Phase-space structure of protohalos: Vlasov versus Particle-Mesh
Stéphane Colombi
The phase-space structure of primordial dark matter halos is revisited using cosmological simulations with three sine waves and Cold Dark Matter (CDM) initial conditions. The simul…
Power spectrum response of large-scale structure in 1D and in 3D: tests of prescriptions for post-collapse dynamics
Anaëlle Halle, Takahiro Nishimichi, Atsushi Taruya +2
The power spectrum response function of the large-scale structure of the Universe describes how the evolved power spectrum is modified by a small change in initial power through no…