A cosmic equation of state for the inhomogeneous universe: can a global far-from-equilibrium state explain dark energy?
نویسندگان
چکیده
منابع مشابه
A cosmic equation of state for the inhomogeneous Universe: can a global far–from–equilibrium state explain Dark Energy?
A system of effective Einstein equations for spatially averaged scalar variables of inhomogeneous cosmological models can be solved by providing a ‘cosmic equation of state’. Recent efforts to explain Dark Energy focus on ‘backreaction effects’ of inhomogeneities on the effective evolution of cosmological parameters in our Hubble volume, avoiding a cosmological constant in the equation of state...
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Our universe is observed to be accelerating due to the dominant dark energy with negative pressure. The dark energy equation of state (w) holds a key to understanding the ultimate fate of the universe. The cosmic voids behave like bubbles in the universe so that their shapes must be quite sensitive to the background cosmology. Assuming a flat universe and using the priors on the matter density ...
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We discuss a degeneracy between the geometry of the universe and the dark energy equation of state wX which exists in the power spectrum of the cosmic microwave background. In particular, for the case with wX < −1, this degeneracy has interesting implications to a lower bound on wX from observations. It is also discussed how this degeneracy can be removed using current observations of type Ia s...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2005
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/22/19/l01