Hydrodynamic approach to the evolution of cosmological structures

Abstract

A hydrodynamic formulation of the evolution of large-scale structure in the Universe is presented. It relies on the spatially coarse-grained description of the dynamical evolution of a many-body gravitating system. Because of the assumed irrelevance of short-range (``collisional'') interactions, the way to tackle the hydrodynamic equations is essentially different from the usual case. The main assumption is that the influence of the small scales over the large-scale evolution is weak: this idea is implemented in the form of a large-scale expansion for the coarse-grained equations. This expansion builds a framework in which to derive in a controlled manner the popular ``dust'' model (as the lowest-order term) and the ``adhesion'' model (as the first-order correction). It provides a clear physical interpretation of the assumptions involved in these models and also the possibility to improve over them.

14 pages, 3 figures. Version to appear in Phys. Rev. D

Cited by in corpus (25)

• Generation of Vorticity and Velocity Dispersion by Orbit Crossing
• Adhesive Gravitational Clustering
• Schrödinger method as N-body double and UV completion of dust
• The growth of structure in the intergalactic medium
• Matter power spectrum from a Lagrangian-space regularization of perturbation theory
• How to generate a significant effective temperature for cold dark matter, from first principles
• Edgeworth streaming model for redshift space distortions
• Gravitational instability via the Schrodinger equation
• Perturbation theory in Lagrangian hydrodynamics for a cosmological fluid with velocity dispersion
• Study of corrections to the dust model via perturbation theory
• Scaling behavior in a stochastic self-gravitating system
• Large-Scale Gas Dynamics in the Adhesion Model: Implications for the Two-Phase Massive Galaxy Formation Scenario
• Scaling Laws in the Cosmic Structure and Renormalization Group
• Coarse-grained cosmological perturbation theory: stirring up the dust model
• Wave-mechanics and the adhesion approximation
• Hydrodynamic Approach to the Evolution of Cosmic Structures II: Study of N-body Simulations at z=0
• Correspondence between the adhesion model and the velocity dispersion for the cosmological fluid
• Density field in extended Lagrangian perturbation theory
• Velocity dispersion in N-body simulations of CDM models
• The Schr$\ddot{o}$dinger-Poisson equations as the large-N limit of the Newtonian N-body system: applications to the large scale dark matter dynamics
• Numerical study of the cosmological velocity field as a function of density
• Non-Gaussianity of one-point distribution functions in extended Lagrangian perturbation theory
• Lagrangian Volume Deformations around Simulated Galaxies
• Cosmological perturbation theory for large scale structure in phase space
• The comparison of velocity distribution between Adhesion approximation and the Euler-Jeans-Newton model