Dirac Cosmology and the Acceleration of the Contemporary Universe

TL;DR

This paper proposes a unified model combining Einstein's General Relativity and Dirac Cosmology, using supernova data to estimate parameters, and finds that creation processes can account for dark energy and dark matter in the universe.

Contribution

It introduces a novel unified cosmological model incorporating creation processes to explain dark energy and dark matter, calibrated with observational data.

Findings

The model yields a dark energy density ratio of 0.8.

The model yields a matter density ratio of 0.2.

The equation of state parameter w_θ is -0.83.

Abstract

A model is suggested to unify the Einstein GR and Dirac Cosmology. There is one adjusted parameter $b_2$ in our model. After adjusting the parameter $b_2$ in the model by using the supernova data, we have calculated the gravitational constant $\bar G$ and the physical quantities of $a(t)$, $q(t)$ and $\rho_r(t)/ \rho_b(t)$ by using the present day quantities as the initial conditions and found that the equation of state parameter $w_{\theta}$ equals to -0.83, the ratio of the density of the addition creation $\Omega_{\Lambda}=0.8$ and the ratio of the density of the matter including multiplication creation, radiation and normal matter $\Omega_m =0.2$ at present. The results are self-consistent and in good agreement with present knowledge in cosmology. These results suggest that the addition creation and multiplication creation in Dirac cosmology play the role of the dark energy and dark matter.