Open AccessThe end of the dark ages in modified Newtonian dynamics
Author(s) -
Stachniewicz S.,
Kutschera M.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2005.09235.x
Subject(s) - physics , modified newtonian dynamics , dark matter , perturbation (astronomy) , cold dark matter , astrophysics , anisotropy , thermal equilibrium , thermal , newtonian fluid , chemical evolution , acceleration , classical mechanics , stars , astronomy , galaxy formation and evolution , thermodynamics , galaxy rotation curve , quantum mechanics , galaxy
We study the evolution of a spherically symmetric density perturbation in the Modified Newtonian Dynamics model applied to the net acceleration over Hubble flow. The background cosmological model is a Λ‐dominated, low‐Ω 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 ≤ 3 × 10 4 M ⊙ ) may collapse already for z ∼ 30 , which is in quite good agreement with the recent Wilkinson Microwave Anisotropy Probe results. A lower value of a 0 would lead to much slower collapse of such objects.