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On the onset of the Jeans instability in a two-component fluid | | J. P. M. de Carvalho
; P. G. Macedo
; | | Date: |
20 May 1996 | | Journal: | Astron.Astrophys. 299 (1995) 326-338 | | Abstract: | Conditions for the establishment of small density perturbations in a self-gravitating two component fluid mixture are studied using a dynamical system approach. It is shown that besides the existence of exponentially growing and decaying modes, which are present for values of the perturbation wave-number $k$ smaller than a critical value $k_{_M}$, two other, pure oscillatory, modes exist at all scales. For $k < k_{_M}$, the growing mode always affects both components of the fluid and not only one of them. Due to the existence of a resonance between the baryonic and the dark perturbations, it is shown that the onset of structure formation in the post recombination epoch is substantially enhanced in a narrow scale band around another critical value $k_{c}$. For dark matter particles having a mass $sim 30$ eV, the corresponding critical mass scale for the establishment of density perturbations at the time of recombination is of the same order of magnitude as the galactic one. | | Source: | arXiv, astro-ph/9605133 | | Services: | Forum | Review | PDF | Favorites | |
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