Constraints on the solid dark Universe model

Battye, Richard A.; Moss, Adam

doi:10.1088/1475-7516/2005/06/001

Constraints on the solid dark Universe model

Richard A. Battye
(
- Jodrell Bank
)
,
Adam Moss
(
- Jodrell Bank
)

Mar, 2005

10 pages

Published in:

JCAP 06 (2005) 001

e-Print:

astro-ph/0503033 [astro-ph]

DOI:

10.1088/1475-7516/2005/06/001

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Abstract: (arXiv)

If the dark energy is modelled as a relativistic elastic solid then the standard CDM and

\Lambda

CDM models, as well as lattice configurations of cosmic strings or domain walls, are points in the two-dimensional parameter space

(w,c_{\rm s}^2)

. We present a detailed analysis of the best fitting cosmological parameters in this model using data from a range of observations. We find that the

\chi^2

is improved by

\sim 10

by including the two parameters and that the

w=-1

\Lambda

CDM model is only the best fit to the data when a large number of different datasets are included. Using CMB observations alone we find that

w=-0.38\pm 0.16

and with the addition of Large-Scale Structure data

w=-0.62\pm 0.15

and

\log c_{\rm s}=-0.77\pm 0.28

. We conclude that the models based on topological defects provide a good fit to the current data, although

\Lambda

CDM cannot be ruled out.

dark energy
dark matter
statistical analysis
cosmic background radiation
cosmological model
defect: topological
supernova
light nucleus: production
cosmic string
domain wall

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