On the equation of state for the [Lambda] field

The recently detected accelerated expansion of the Universe is related to the existence of a new type of matter called the field or quintessence. Constraints were obtained on its equation of state from the absence of clustering of this matter on scales much smaller than the cosmological horizon. The...

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Published in:Astronomy letters 2002-07, Vol.28 (7), p.434-437
Main Author: Podolsky, D I
Format: Article
Language:English
Subjects:
Astronomy
Chaplygin gas
Clustering
Equations of state
Fittings
Horizon
Star & galaxy formation
Universe
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description The recently detected accelerated expansion of the Universe is related to the existence of a new type of matter called the field or quintessence. Constraints were obtained on its equation of state from the absence of clustering of this matter on scales much smaller than the cosmological horizon. The question of how these constraints affect the possibility of fitting the accelerated expansion by such cosmological models as the Chaplygin gas model is discussed.
doi_str_mv 10.1134/1.1491965
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subjects Astronomy
Chaplygin gas
Clustering
Equations of state
Fittings
Horizon
Star & galaxy formation
Universe
title On the equation of state for the [Lambda] field
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