Dirac Cosmology and the Acceleration of the Contemporary Universe

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.

arXiv comment13 pages, 8 figures

References in corpus (29)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• Modified gravity with negative and positive powers of the curvature: unification of the inflation and of the cosmic acceleration
• The fundamental constants and their variation: observational status and theoretical motivations
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Can modified gravity explain accelerated cosmic expansion?
• Progress in Lunar Laser Ranging Tests of Relativistic Gravity
• 1/R gravity and Scalar-Tensor Gravity
• The Cosmology of Generalized Modified Gravity Models
• On Physical Equivalence between Nonlinear Gravity Theories
• Violations of the equivalence principle in a dilaton-runaway scenario
• Runaway dilaton and equivalence principle violations
• Post-Newtonian constraints on f(R) cosmologies in Palatini formalism
• Post-Newtonian constraints on f(R) cosmologies in metric formalism
• A theoretician's analysis of the supernova data and the limitations in determining the nature of dark energy
• Cosmological parameters from supernova observations: A critical comparison of three data sets
• Palatini form of 1/R gravity
• Higher order gravity theories and scalar tensor theories
• Varying Alpha in a More Realistic Universe
• The Force of Gravity from a Lagrangian containing Inverse Powers of the Ricci Scalar
• Generalized Gravity and a Ghost
• Varying-$\alpha$ Theories and Solutions to the Cosmological Problems
• Local and Global Variations of The Fine Structure Constant
• Inhomogeneous Gravity
• On the Newtonian Limit in Gravity Models with Inverse Powers of R
• Can higher order curvature theories explain rotation curves of galaxies?
• Inflatonless inflation
• An alternative explanation of the conflict between 1/R gravity and solar system tests
• Spatial Variations of Fundamental Constants

Cited by in corpus (1)

• On the action for Weyssenhoff spin fluid and the Barbero-Immirzi parameter