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Title:
Light-cone observations and cosmological models: implications for inhomogeneous models mimicking dark energy
Authors:
Kolb, Edward W.; Lamb, Callum R.
Publication:
eprint arXiv:0911.3852
Publication Date:
11/2009
Origin:
ARXIV
Keywords:
Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:
18 pages, 13 figures
Bibliographic Code:
2009arXiv0911.3852K

Abstract

Cosmological observables are used to construct cosmological models. Since cosmological observations are limited to the light cone, a fixed number of observables (even measured to arbitrary accuracy) may not uniquely determine a cosmological model without additional assumptions or considerations. A prescription for constructing a spherically symmetric, inhomogeneous cosmological model that exactly reproduces the luminosity-distance as a function of redshift and the light-cone mass density as a function of redshift of a $\Lambda$CDM model is employed to gain insight into how an inhomogeneous cosmological model might mimic dark energy models.
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