TITLE:
A New Version of the Lambda-CDM Cosmological Model, with Extensions and New Calculations
AUTHORS:
Jan Helm
KEYWORDS:
Lambda-DCM, Friedmann Equations, CMB, Metric Perturbation, Hubble Parameter
JOURNAL NAME:
Journal of Modern Physics,
Vol.15 No.2,
February
23,
2024
ABSTRACT: This article gives a state-of-the-art description of the cosmological Lambda-CDM model and in addition, presents extensions of the model with new calculations of background and CMB functions. Chapters 1-4 describe the background part of the model, i.e. the evolution of scale factor and density according to the Friedmann equations, and its extension, which results in a correction of the Hubble parameter, in agreement with new measurements (Cepheids-SNIa and Red-Giants). Based on this improved background calculation presented in chapters 5-9 the perturbation part of the model, i.e. the evolution of perturbation and structure according to the perturbed Einstein equations and continuity-Euler equations, and the power spectrum of the cosmic microwave background (CMB) is calculated with a new own code.