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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2017 (Baltic Astronomy): 0.417
5-year IMPACT FACTOR (Baltic Astronomy): 0.486

CiteScore 2017: 0.16

SCImago Journal Rank (SJR) 2017: 0.131
Source Normalized Impact per Paper (SNIP) 2017: 0.109

ICV 2017: 121.03

Open Access
Online
ISSN
2543-6376
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Volume 25, Issue 2

Issues

Improvements on a Unified Dark Matter Model

A. Del Popolo
  • Dipartimento di Fisica e Astronomia, Universitá di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
  • INFN sezione di Catania, via S. Sofia, 95123 Catania, Italy
  • International Institute of Physics, Universidade Federal do Rio Grande do Norte, 59012-970 Natal, Brazil
  • Institute of Modern Physics, Chinese Academy of Sciences, Post Office Box 31, Lanzhou 730000, Peoples Republic of China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Xi-Guo Lee
  • Institute of Modern Physics, Chinese Academy of Sciences, Post Office Box 31, Lanzhou 730000, Peoples Republic of China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-02-01 | DOI: https://doi.org/10.1515/astro-2017-0123

Abstract

We study, by means of a spherical collapse model, the effect of shear, rotation, and baryons on a generalized Chaplygin gas (gCg) dominated universe. We show that shear, rotation, and the presence of baryons slow down the collapse compared 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

REFERENCES

About the article

Published Online: 2017-02-01

Published in Print: 2016-06-01


Citation Information: Open Astronomy, Volume 25, Issue 2, Pages 211–223, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0123.

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© 2016 A. Del Popolo et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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