منابع مشابه
Inhomogeneities in the Universe and the Fitting Problem
Observational cosmology provides us with a large number of high precision data which are used to derive models trying to reproduce “on the mean” our observable patch of the Universe. Most of these attempts are achieved in the framework of a Friedmann-Lemâıtre cosmology where large scale homogeneity is assumed, following the so-called Cosmological “Principle”. However, we know, from the observat...
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Galaxy structures represent one of the most challenging observations in cosmology. Whether or not these structures are found to be compatible with the standard model of galaxy formation crucially depends on the a-priori and assumptions encoded in the statistical methods employed to characterize the data and on the a-posteriori hypotheses made to interpret the results. We present strategies to t...
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We investigate the distribution of energy density in a stationary self-reproducing inflationary universe. We show that the main fraction of volume of the universe in a state with a given density ρ at any given moment of proper time t is concentrated near the centers of deep exponentially wide spherically symmetric wells in the density distribution. Since this statement is very surprising and co...
متن کاملLight Propagation through Large-scale Inhomogeneities in the Universe and Its Impact on Cosmological Observations
This paper analyses cosmological observations within inhomogeneous and exact solutions of the Einstein equations. In some way the analyses presented here can be freed from assumptions such as small amplitude of the density contrast. The supernova observations are analysed using the Lemâıtre–Tolman model and the CMB observations are analysed using the quasispherical Szekeres model. The results s...
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Since its decovery during the late 90’s, the dimming of distant SN Ia apparent luminosity has been mostly ascribed to the influence of a mysterious dark energy component. Formulated in a Friedmannian cosmological modelling framework based upon the cosmological “principle” hypothesis, this interpretation has given rise to the “concordance” model. However, a caveat of such a reasoning is that the...
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ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2011
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/28/16/164003