Open AccessThe Radiation-Dominated Universe in Nonstandard Cosmology
Author(s) -
Günter Scharf
Publication year - 2020
Publication title -
advances in astrophysics
Language(s) - English
Resource type - Journals
eISSN - 2415-6469
pISSN - 2415-6450
DOI - 10.22606/adap.2020.54003
Subject(s) - physics , cosmology , big bang (financial markets) , big crunch , universe , hubble's law , dark radiation , radiative transfer , cold dark matter , perturbation (astronomy) , mathematical physics , classical mechanics , theoretical physics , astrophysics , de sitter universe , dark energy , quantum mechanics , steady state theory , finance , economics
We continue the recent study of our model theory of low-density cosmology without dark matter. We assume a purely radiative spherically symmetric background and treat matter as anisotropic perturbations. Einstein’s equations for the background are solved numerically. We find two irregular singular points, one is the Big Bang and the other a Big Crunch. The radiation temperature continues to decrease for another 0.21 Hubble times and then starts to increase towards infinity. Then we derive the four evolution equations for the anisotropic perturbations. In the Regge- Wheeler gauge there are three metric perturbations and a radial velocity perturbation. The solution of these equations allow a detailed discussion of the cosmic evolution of the model universe under study.