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Astronomy Letters

, Volume 43, Issue 10, pp 635–643 | Cite as

Improvements on a unified dark matter model

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Abstract

We study, by means of a spherical collapse model, the effect of shear, rotation, and baryons on a generalized Chaplygin gas (gCg) dominated universes. We show that shear, rotation, and the baryon presence slow down the collapse with respect to the simple spherical collapse model. The slowing down in the growth of density perturbation is able to solve the instability of the unified dark matter (UDM) models described in previous papers (e.g., Sandvik et al. 2004) at the linear perturbation level, as also shown by a direct comparison of our model with previous results.

Keywords

cosmology theory large scale structure of Universe galaxies formation 

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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  1. 1.Institute of Modern PhysicsChinese Academy of SciencesLanzhouPeople’s Republic of China
  2. 2.Dipartimento di Fisica e AstronomiaUniversitá di CataniaCataniaItaly
  3. 3.INFN Sezione di Catania, via S. SofiaCataniaItaly

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