## Extending the scope of models for large-scale structure formation in the universe
^{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)
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
* On leave from: Theoretische Physik, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany (buchert@theorie.physik.uni-muenchen.de)
This article contains no SIMBAD objects. ## Contents- 1. Introduction
- 2. Basic equations and restrictive assumptions
- 3. The role of pressure: Burgers-like equations
- 4. The role of noise: emergence of a KPZ-like equation
- 5. The linear theory revisited
- 6. Conclusions
- Acknowledgements
- Appendices
- References
© European Southern Observatory (ESO) 1999 Online publication: September 2, 1999 |