Spherical top-hat collapse of a viscous unified dark fluid
In: The European Physical Journal C, Jg. 74, Heft 5
Online
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Zugriff:
In this paper, we test the spherical collapse of a viscous unified dark fluid (VUDF) which has constant adiabatic sound speed and show the nonlinear collapse for VUDF, baryons, and dark matter, which are important in forming the large-scale structure of our Universe. By varying the values of the model parameters $$\alpha $$ and $$\zeta _{0}$$ , we discuss their effects on the nonlinear collapse of the VUDF model, and we compare its result to the $$\Lambda $$ CDM model. The results of the analysis show that, within the spherical top-hat collapse framework, larger values of $$\alpha $$ and smaller values of $$\zeta _{0}$$ make the structure formation earlier and faster, and the other collapse curves are almost distinguished with the curve of $$\Lambda $$ CDM model if the bulk viscosity coefficient $$\zeta _{0}$$ is less than $$10^{-3}$$ .
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Spherical top-hat collapse of a viscous unified dark fluid
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Autor/in / Beteiligte Person: | Xu, Lixin ; Li, Wei |
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Zeitschrift: | The European Physical Journal C, Jg. 74, Heft 5 |
Veröffentlichung: | Springer Nature |
Medientyp: | unknown |
ISSN: | 1434-6044 (print) |
DOI: | 10.1140/epjc/s10052-014-2870-y |
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