Extending the scope of models for large-scale structure formation in the Universe

Abstract

We propose a phenomenological generalization of the models of large-scale structure formation in the Universe by gravitational instability in two ways: we include pressure forces to model multi-streaming, and noise to model fluctuations due to neglected short-scale physical processes. We show that pressure gives rise to a viscous-like force of the same character as that one introduced in the ``adhesion model'', while noise leads to a roughening of the density field yielding a scaling behavior of its correlations.

matches published version in A&A, incl. 3 figures

Cited by in corpus (6)

• BEC dark matter, Zeldovich approximation and generalized Burgers equation
• Perturbation theory in Lagrangian hydrodynamics for a cosmological fluid with velocity dispersion
• Correspondence between the adhesion model and the velocity dispersion for the cosmological fluid
• Density field in extended Lagrangian perturbation theory
• Stochastic contribution to the growth factor in the LCDM model
• The comparison of velocity distribution between Adhesion approximation and the Euler-Jeans-Newton model