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- W2011651544 abstract "We explore the possibility that the dark matter and dark energy are mimicked by a single fluid or by a single $k$-essence-like scalar field. The so called Chaplygin gas unified dark matter models can reproduce the observed matter power spectrum by adding a baryon component. It has been argued that the evolution of the baryon fluctuations is particularly favoured for the superluminal case where the sound speed of the Chaplygin gas exceeds the speed of light at late times, as well as for the models with the negligibly small sound speed. In this note we compute the integrated Sachs-Wolfe signal in the Chaplygin gas models, focusing on the superluminal case which has not been investigated before because of the premature understanding of causality. It is shown that the superluminal model leads to large enhancement of the integrated Sachs-Wolfe effect, which is inconsistent with the CMB measurements." @default.
- W2011651544 created "2016-06-24" @default.
- W2011651544 creator A5039741429 @default.
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- W2011651544 date "2010-07-27" @default.
- W2011651544 modified "2023-09-27" @default.
- W2011651544 title "A note on observational signatures in superluminal unified dark matter models" @default.
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- W2011651544 doi "https://doi.org/10.1088/1475-7516/2010/07/027" @default.
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