Light-cone observations and cosmological models: implications for inhomogeneous models mimicking dark energy

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.

18 pages, 13 figures

References in corpus (3)

• Distinguishing Between Void Models and Dark Energy with Cosmic Parallax and Redshift Drift
• Accelerated expansion without dark energy
• Lensing effects in inhomogeneous cosmological models

Cited by in corpus (17)

• Inhomogeneous cosmological models: exact solutions and their applications
• Light-cone averaging in cosmology: formalism and applications
• Establishing homogeneity of the universe in the shadow of dark energy
• Observational constraints on inhomogeneous cosmological models without dark energy
• Average expansion rate and light propagation in a cosmological Tardis spacetime
• The Cosmic Microwave Background in an Inhomogeneous Universe - why void models of dark energy are only weakly constrained by the CMB
• Observational constraints on the LLTB model
• Virialisation-induced curvature as a physical explanation for dark energy
• CMB observations in LTB universes: Part I: Matching peak positions in the CMB spectrum
• Exact spherically-symmetric inhomogeneous model with n perfect fluids
• CMB observations in LTB universes: Part II: the kSZ effect in an LTB universe
• Evidence for an environment-dependent shift in the baryon acoustic oscillation peak
• Chaplygin gas and effective description of inhomogeneous universe models in general relativity
• Can the cosmological constant be mimicked by smooth large-scale inhomogeneities for more than one observable?
• Evolution of density perturbations in large void universe
• Discriminating different models of luminosity-redshift distribution
• Lightcone Averaging and Precision Cosmology