The end of the Dark Ages in MOND

Details The end of the Dark Ages in MOND The end of the Dark Ages in MOND

2004-12-23

arxiv.org/abs/astro-ph/0412614v1

Mon.Not.Roy.Astron.Soc. 362 (2005) 89-94

Astronomy and Astrophysics

Astrophysics

6 pages, 11 figures, LaTeX 2e with MN2e, MNRAS submitted

Scientific paper

10.1111/j.1365-2966.2005.09235.x

We study the evolution of a spherically symmetric density perturbation in the Modified Newtonian Dynamics (MOND) model applied to the net acceleration over Hubble flow. The background cosmological model is a $\Lambda$-dominated, low-$\Omega_b$ Friedmann model with no Cold Dark Matter. We include thermal processes and non-equilibrium chemical evolution of the collapsing gas. We find that under these assumptions the first low-mass objects ($M \le 3\times 10^4 M_{\odot}$) may collapse already for $z\sim 30$, which is in quite good agreement with the recent WMAP results. A lower value of $a_0$ would lead to much slower collapse of such objects.

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