Current constraints on anisotropic and isotropic dark energy models
نویسندگان
چکیده
منابع مشابه
Constraints on dark energy and its models
The two most conspicuous features of dark energy are smooth spatial distribution and large negative pressure. While only vacuum energy is absolutely uniform in its spatial distribution, all the other examples of dark energy only clump on the largest scales at a level that can be neglected for most purposes. In the absence of a compelling theoretical model or framework for dark energy it can be ...
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The recent observations of type Ia supernova strongly support that the universe is accelerating now and decelerated in the recent past. This may be the evidence of the breakdown of the standard Friedmann equation. We consider a general modified Friedmann equation. Three different models are analyzed in detail. The current supernova data and the Wilkinson microwave anisotropy probe data are used...
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Since the discovery of the accelerated expansion of the universe, it was necessary to introduce a new component of matter distribution called dark energy. The standard cosmological model considers isotropy of the pressure and assumes an equation of state p = ωρ, relating the pressure p and the energy density ρ. The interval of the parameter ω defines the kind of matter of the universe, related ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2019
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.99.023516