Extending the scope of models for large-scale structure formation in the universe
T. Buchert * 1,
A. Domínguez 2 and
J. Pérez-Mercader 2
Received 23 November 1998 / Accepted 29 March 1999
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 the one introduced in the adhesion model , while noise leads to a roughening of the density field, yielding a scaling behavior of its correlations.
Key words: gravitation hydrodynamics instabilities methods: analytical cosmology: theory cosmology: large-scale structure of Universe
Send offprint requests to: A. Domínguez
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© European Southern Observatory (ESO) 1999
Online publication: September 2, 1999