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Astron. Astrophys. 325, 1-8 (1997)

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A modification of the baryonic dark matter model

Attila Mészáros

Department of Astronomy, Charles University, 150 00 Prague 5, védská 8, Czech Republic

Received 7 August 1996 / Accepted 18 March 1997

Abstract

The conventional baryonic dark matter model of galaxy formation uses the concept of entropy fluctuations. The key idea of this picture is based on the assumption that already before the recombination on the scales characterized by masses not bigger than [FORMULA] the entropic fluctuations were non-linear, and they were formed by non-gravitational processes. In this paper the basis of a modification of the baryonic dark matter picture is presented. This modification uses - instead of the entropic fluctuations - the concept of adiabatic perturbations existing only during and after the recombination. It reproduces the key idea of conventional picture: roughly for solar masses bold anisotropies should occur immediately during the recombination. Nevertheless, contrary to the conventinonal picture, this occurs without any non-gravitational phenomenons. All this follows from the so called "Bessel-Macdonald" instability, which is predicted to exist by a careful mathematical analysis of the key equation of adiabatic perturbations.

Key words: cosmic microwave background – dark matter

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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