Dynamical Constraints on the Cosmological Parameters

2007/09/15 by Gu, Ying-Qiu
#Astrophysics (astro-ph) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.0709.2414

Abstract

In cosmology, the cosmic curvature K and the cosmological constant Λ are two important parameters, and the values have strong influence on the behavior of the universe. In the context of normal cosmology, under the ordinary assumptions of positive mass-energy and initial negative pressure, we find the initial singularity of the universe is certainly absent and we have K=1. This means total spatial structure of the universe should be a 3-dimensional sphere S³. For the cyclic cosmological model, we have Λ\lesssim 10^-24 \rm ly^-2. Obviously, such constraints would be helpful for the researches on the properties of dark matter and dark energy in cosmology.

Related

• Observational constraints on the cosmological expansion rate and spatial curvature
• Cosmological constraints from standardized non-CMB observations
• Constraints on cosmological parameters
• The Cosmological Constant as a Function of Extrinsic Curvature and Spatial Curvature
• Observational constraints on dark energy cosmological model parameters