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Astron. Astrophys. 349, 343-353 (1999)

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

T. Buchert  *  1, A. Domínguez 2 and J. Pérez-Mercader 2

1 Theory Division, CERN, CH-1211 Geneva 23, Switzerland
2 Laboratorio de Astrofísica Espacial y Física Fundamental, Apartado 50727, E-28080 Madrid, Spain (dominguez, mercader@laeff.esa.es)

Received 23 November 1998 / Accepted 29 March 1999

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 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

* On leave from: Theoretische Physik, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany (buchert@theorie.physik.uni-muenchen.de)

Send offprint requests to: A. Domínguez

This article contains no SIMBAD objects.

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© European Southern Observatory (ESO) 1999

Online publication: September 2, 1999
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