Focus on Dark Energy
نویسندگان
چکیده
منابع مشابه
On Anisotropic Dark Energy
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 ...
متن کاملOn Oscillating Dark Energy
Distance-redshift data can impose strong constraints on dark energy models even when the equation of state is oscillatory. Despite the double integral dependence of the distance on the equation of state, precision measurement of the distance-redshift relation for z = 0− 2 is more incisive than the linear growth factor, CMB last scattering surface distance, and the age of the universe in disting...
متن کاملOn Anisotropic Dark Energy Stars
Abstract Anisotropic pressure dark energy stars are recently proposed as an alternative model to gravastar. However, the nature’s classification of the fluid was based on the interval of the parameter ω, defined by the state equation that comes directly from the isotropic pressure Friedmann cosmological models. This procedure is not correct. In this work we propose a generalization of the limit...
متن کاملThrowing light on dark energy.
Supernova observations show that the expansion of the universe has been speeding up. This unexpected acceleration is ascribed to a dark energy that pervades space. Supernova data, combined with other observations, indicate that the universe is about 14 billion years old and is composed of about 30%matter and 70%dark energy. New observational programs can trace the history of cosmic expansion mo...
متن کاملGeometrical Constraints on Dark Energy
We explore the recently introduced statefinder parameters. After reviewing their basic properties, we calculate the statefinder parameters for a variety of cosmological models, and investigate their usefulness as a means of theoretical classification of dark energy models. We then go on to consider their use in obtaining constraints on dark energy from present and future supernovae type Ia data...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2006
ISSN: 1367-2630
DOI: 10.1088/1367-2630/8/12/e07