Consistency of LCDM with Geometric and Dynamical Probes

Abstract

The LCDM cosmological model assumes the existence of a small cosmological constant in order to explain the observed accelerating cosmic expansion. Despite the dramatic improvement of the quality of cosmological data during the last decade it remains the simplest model that fits remarkably well (almost) all cosmological observations. In this talk I review the increasingly successful fits provided by LCDM on recent geometric probe data of the cosmic expansion. I also briefly discuss some emerging shortcomings of the model in attempting to fit specific classes of data (eg cosmic velocity dipole flows and cluster halo profiles). Finally, I summarize recent results on the theoretically predicted matter overdensity (${\delta }_m=\frac{\delta {\rho }_m}{{\rho }_m}$) evolution (a dynamical probe of the cosmic expansion), emphasizing its scale and gauge dependence on large cosmological scales in the context of general relativity. A new scale dependent parametrization which describes accurately the growth rate of perturbations even on scales larger than 100h^{-1}Mpc is shown to be a straightforward generalization of the well known scale independent parametrization f(a)=\omms(a)^γvalid on smaller cosmological scales.

20 pages, 6 figures. Invited review at the 1st Mediterranean Conference on Classical and Quantum Gravity (MCCQG). To appear in the proceedings

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Cited by in corpus (18)

• Hubble parameter measurement constraints on dark energy
• Binned Hubble parameter measurements and the cosmological deceleration-acceleration transition
• Hubble parameter data constraints on dark energy
• Constraints on dark energy from H II starburst galaxy apparent magnitude versus redshift data
• Galaxy cluster number count data constraints on cosmological parameters
• Exact cosmological solution of a Scalar-Tensor Gravity theory compatible with the $\Lambda CDM$ model
• Galaxy cluster angular size data constraints on dark energy
• Exploring hints for dark energy density evolution in light of recent data
• Constraints on dark energy from the Lyα forest baryon acoustic oscillations measurement of the redshift 2.3 Hubble parameter
• Time and distance constraints on accelerating cosmological models
• Asymmetry in the reconstructed deceleration parameter
• Observational constraints on dark energy cosmological model parameters
• Forecasting cosmological parameter constraints from near-future space-based galaxy surveys
• Mimicking the LCDM model with Stealths
• Dynamical dark energy models with singularities in the view of the forthcoming results of the growth observations
• QCD-scale modified-gravity universe
• CDM and Baryons as Distinct Fluids in a Linear Approximation for the Growth of Structure
• Intermediate evolution using SNIa, and BAO