Alternatives to quintessence model-building
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7 pages
Published in:
- Phys.Rev.D 67 (2003) 023511
e-Print:
- astro-ph/0208528 [astro-ph]
Report number:
- DAMTP-2002-106
View in:
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Abstract: (arXiv)
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quintessence models, known as Cardassian expansion and the Chaplygin gas. We show that the former is enteriely equivalent to a class of quintessence models. We determine the observational constraints on the latter, coming from recent supernovae results and from the shape of the matter power spectrum. As expected, these restrict the model to a behaviour that closely matches that of a standard cosmological constant .- 98.80.Cq
- dark energy
- quintessence
- gas: Chaplygin
- Friedman model
- supernova
- cosmological constant
- numerical calculations: interpretation of experiments
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